CHAPTER 3. MARKET AND TECHNOLOGY ASSESSMENT

TABLE OF C ONTENTS

3.1 INTRODUCTION

................................... ........................................................................ 3­1

3.1.1 Definitions............................................................................................................ 3 ­1

3.1.1.1 Fluorescent L amps

................................................................................... 3­1

3.1.1.2 General S ervice Fluorescent Lamps

........................................................ 3­2

3.1.1.3 Incandescent R eflector Lamps

................................................................. 3­3

3.2 MARKET A SSESSMENT

.............................................................................................. 3­4

3.2.1 Trade A ssociation

................................................................................................ 3­4

3.2.2 Manufacturers a nd Market Share......................................................................... 3­5

3.2.2.1 Small B usinesses...................................................................................... 3­6

3.2.3 Regulatory P rograms

........................................................................................... 3­7

3.2.3.1 Federal En ergy Conservation Standards

.................................................. 3­7

3.2.3.2 Canadian En ergy Efficiency Standards

................................................. 3­10

3.2.4 Non­Regulatory I nitiatives................................................................................. 3­12

3.2.4.1 Federal En ergy Management Program

.................................................. 3­12

3.2.4.2 Consortium f or Energy Efficiency......................................................... 3­12

3.2.4.3 Energy Ef ficient Commercial Building Deduction................................ 3­12

3.2.4.4 Northeast En ergy Efficiency Partnerships

............................................. 3­13

3.2.5 Historical S hipments.......................................................................................... 3­13

3.3 TECHNOLOGY A SSESSMENT.................................................................................. 3­16

3.3.1 General S ervice Fluorescent Lamps

.................................................................. 3­16

3.3.1.1 Highly Em issive Electrode Coatings

..................................................... 3­18

3.3.1.2 Higher Ef ficiency Lamp Fill Gas Composition

..................................... 3­18

3.3.1.3 Higher Ef ficiency Phosphors

................................................................. 3­20

3.3.1.4 Glass C oatings

....................................................................................... 3­25

3.3.1.5 Higher Ef ficiency Lamp Diameter......................................................... 3­25

3.3.1.6 Multi­Photon Phosphors

..................... ................................................... 3­26

3.3.2 Incandescent R eflector Lamps

........................................................................... 3­26

3.3.2.1 Higher Te mperature Operation

.............................................................. 3­27

3.3.2.2 Microcavity F ilaments

........................................................................... 3­28

3.3.2.3 Novel F ilament Materials

...................................................................... 3­29

3.3.2.4 Thinner F ilaments

.................................................................................. 3­29

3.3.2.5 Efficient F ilament Coiling

..................................................................... 3­29

3.3.2.6 Crystallite F ilament Coatings

................................................................ 3­29

3.3.2.7 Efficient F ilament Orientation

............................................................... 3­29

3.3.2.8 Higher Ef ficiency Inert Fill Gas

............................................................ 3­30

3.3.2.9 Luminescent G as.................................................................................... 3­30

3.3.2.10 Tun gsten­Halogen Lamps................................................................. 3­30

3.3.2.11 Higher P ressure Tungsten­Halogen Lamps

...................................... 3­30

3.3.2.12 Non ­Tungsten­Halogen Regenerative Cycles................................... 3­31

3.3.2.13 Infrared Glass C oatings..................................................................... 3­31

3.3.2.14 Integrally B allasted Low­Voltage Lamps

......................................... 3­31

3­i3.3.2.15 Higher Efficiency R eflector Coatings............................................... 3­31

3.3.2.16 Trihedral Corner R eflectors

.............................................................. 3­32

3.3.2.17 Efficient Filament P lacement............................................................ 3­32

3.4 PRODUCT CL ASSES................................................................................................... 3­32

3.4.1 General Service F luorescent Lamps

.................................................................. 3­32

3.4.1.1 Physical Constraints of F luorescent Lamps

........................................... 3­33

3.4.1.2 Lumen Package

.............................. ........................................................ 3­34

3.4.1.3 Correlated Co lor Temperature

............................................................... 3­34

3.4.1.4 Ballast Interoperability........................................................................... 3 ­34

3.4.1.5 Lamp Wattage

............................... ......................................................... 3­35

3.4.1.6 Lamp Diameter

.............................. ........................................................ 3­35

3.4.1.7 Color Rendering I ndex........................................................................... 3­36

3.4.1.8 Product Classes a nd Standard Form for GSFL

...................................... 3­36

3.4.2 Incandescent Re flector Lamps

........................................................................... 3­36

3.4.2.1 Wattage

.................................................................................................. 3­37

3.4.2.2 Modified Spectrum

................................................................................ 3­37

3.4.2.3 Spot Versus F lood Incandescent Reflector Lamps

................................ 3­38

3.4.2.4 Product Classes a nd Standard Form for IRL

......................................... 3­38

REFERENCES

.......................................................................................................................... 3­40

LIST OF T ABLES

Table 3.2.1 NEM A General Service Fluorescent Lamp and Incandescent Reflector Lamp

Manufacturers

.............................................................................................................................. 3­5

Table 3.2.2 General Service Fluorescent Lamp Manufacturers

................................................. 3­6

Table 3.2.3 Incandescent Reflector Lamp Manufacturers

.......................................................... 3­6

Table 3.2.4 Small Business Manufacturers of General Service Fluorescent Lamps or

Incandescent Reflector Lamps

..................................................................................................... 3­7

Table 3.2.5 Federal Regulations for General Service Fluorescent Lamps

................................. 3­8

Table 3.2.6 EPCA Standards for Fluorescent Lamp Ballasts

..................................................... 3­8

Table 3.2.7 EPACT 2005 Standards for Fluorescent Lamp Ballasts.......................................... 3­9

Table 3.2.8 Federal Regulations for Incandescent Reflector Lamps

........................................... 3­9

Table 3.2.9 Canadian Energy Efficiency Regulations for Incandescent Reflector Lamps....... 3­11

Table 3.2.10 Federal Energy Management Program Efficiency Recommendation

................. 3­12

Table 3.2.11 NEMA Shipments of Four­Foot General Service Fluorescent Lamps

................. 3­14

Table 3.2.12 NEMA Shipments of Eight­Foot Single Pin Slimline General Service Fluorescent

Lamps......................................................................................................................................... 3­14

Table 3.2.13 NEMA Shipments of Two­Foot U­Shaped General Service Fluorescent Lamps 3­15

Table 3.2.14 NEMA Shipments of Eight­Foot High Output General Service Fluorescent Lamps

............................................................................................................................... ..................... 3­15

Table 3.2.15 NEMA Shipments of Incandescent Reflector Lamps........................................... 3­16

Table 3.4.1 EPCA Product Classes for General Service Fluorescent Lamps

........................... 3­33

Table 3.4.2 DOE ANOPR Product Classes for GSFL.............................................................. 3­36

Table 3.4.3 EPCA Product Classes for Incandescent Reflector Lamps

................................... 3­37

Table 3.4.4 DOE ANOPR Product Classes for IRL

.................................................................. 3­39

3­iiLIST OF FIGURES

Figure 3.3.1 L amp Length Effects on Efficacy......................................................................... 3­17

Figure 3.3.2 Lamp Fill Gas Effect on UV Output for T12 Lamps

........................................... 3­19

Figure 3.3.3 Lamp Fill Gas Effect on Thermionic Emission for T12 Lamps........................... 3­20

Figure 3.3.4 Human Eye Photopic Spectral Luminous Efficiency Function, V(λ)

.................. 3­21

Figure 3.3.5 Sample Power Spectrum Distribution

.................................................................. 3­22

Figure 3.3.6 Average Efficacies of Lamps with a CCT of 6,500K versus 4,100K

.................. 3­23

Figure 3.3.7 Lamp Efficacies for Halo­ and Rare­Earth Phosphors

......................................... 3­24

Figure 3.3.8 Light Output versus Phosphor Thickness............................................................. 3­24

Figure 3.3.9 Bulb Diameter versus Efficacy............................................................................. 3­26

Figure 3.3.10 Radiating Characteristics of Tungsten................................................................ 3­27

Figure 3.3.11 Luminous Efficacy versus Color Temperature................................................... 3­28

Figure 3.4.1 Illustration of IRL Candidate Standard Level Forms

........................................... 3­39

3­iiiCHAPTER 3. MARKET AND TECHNOLOGY ASSESSMENT

3.1 INTRODUCTION

This chapter d etails the market and technology assessment that the U.S. Department of

Energy (DOE) has conducted in support of the ongoing energy conservation standards and test

procedures rulemakings for general service fluorescent lamps (GSFL) and incandescent reflector

lamps (IRL). These rulemakings are mandated by the Energy Policy and Conservation Act, as

amended (EPCA), and are effective for lamps manufactured in and after 2012.

This chapter c onsists of three sections: the market assessment, the technology

assessment, and product classes. The market assessment provides an overall picture of the

market for the products concerned, including the nature of the products, industry structure, and

manufacturer market shares; regulatory and non­regulatory efficiency improvement programs;

and market trends and quantities of products sold. The technology assessment identifies a

preliminary list of technologies to consider in the screening analysis. The product classes section

discusses the product classes DOE considered using for this rulemaking and how they were

developed.

The information D OE gathers from the market and technology assessment serves as

resource material for use throughout the rulemaking. DOE considers both quantitative and

qualitative information from publicly available sources and stakeholders in this assessment.

3.1.1 Definitions

This rulemaking covers c ertain types of fluorescent and incandescent reflector lamps.

Section 321(30) of EPCA (42 U.S.C. 6291(30)) contains definitions for “fluorescent lamp,”

“general service fluorescent lamp,” “incandescent lamps,” and “incandescent reflector lamp,”

DOE codified in the CFR the statutory definitions and definitions of supplementary terms for

fluorescent and incandescent lamps. 62 FR 29222 (May 29, 1997); 10 CFR section 430.2.

Appendix 3A lists these terms and their definitions.

As part o f this energy conservation standards rulemaking, DOE is considering extending

coverage to additional general service fluorescent lamps. (42 U.S.C. 6295(i)(5)) The following

sections describe in more detail EPCA’s definitions for fluorescent and incandescent lamps, note

DOE’s interpretation of the definitions, and note the definitions DOE is considering revising or

developing. Please see section II of the ANOPR Federal Register notice associated with this

rulemaking for more discussion on DOE’s preliminary consideration of additional fluorescent

and incandescent lamps, its interpretation of EPCA’s definitions and its consideration to develop

or revise non­statutory definitions.

3.1.1.1 Fluorescent La mps

Section 321(30)(A) o f EPCA (42 U.S.C. 6291(30)(A)) defines a fluorescent lamp as:

3­1“a low pressure mercury electric­discharge source in which a fluorescing coating

transforms some of the ultraviolet energy generated by the mercury discharge into light,

including only the following:

(i) Any straight­shaped lamp ( commonly referred to as 4­foot medium bi­pin lamps)

with medium bi­pin bases of nominal overall length of 48 inches and rated wattage of 28

or more.

(ii) Any U­shaped l amp (commonly referred to as 2­foot U­shaped lamps) with

medium bi­pin bases of nominal overall length between 22 and 25 inches and rated

wattage of 28 or more.

(iii) Any rapid s tart lamp (commonly referred to as 8­foot high output lamps) with

recessed double contact bases of nominal overall length of 96 inches and 0.800 nominal

amperes, as defined in ANSI C78.1­1978 and related supplements.

(iv) Any instant s tart lamp (commonly referred to as 8­foot slimline lamps) with

single pin bases of nominal overall length of 96 inches and rated wattage of 52 or more,

as defined in ANSI C78.3­1978 (R1984) and related supplement ANSI C78.3a­1985.”

In a f inal rule published May 29, 1997, DOE updated section 321(30)(A)(iv) references

of American National Standards Institute (ANSI) standards by changing “ANSI C78.3­1978”

and “ANSI C78.3a­1985” to ANSI C78.1­1991 and C78.3­1991. a 62 FR 29222.

3.1.1.2 General Service F luorescent Lamps

Section 321(30)(B) o f EPCA (42 U.S.C. 6291(30)(B)) defines general service fluorescent

lamps as:

“fluorescent la mps which can be used to satisfy the majority of fluorescent applications,

but does not include any lamp designed and marketed for the following nongeneral

lighting applications:

(i) Fluorescent la mps designed to promote plant growth.

(ii) Fluorescent la mps specifically designed for cold temperature installations.

(iii) Colored fluorescent l amps.

(iv) Impact­resistant fl uorescent lamps.

a ANSI C78.3­1978 is an ANSI­published guide to standard characteristics for instant start and cold­cathode

fluorescent lamps. C78.1­1978 is the equivalent guide for rapid start fluorescent lamps. Supplements to C78.3­

1978 and C78.1­1978 update the guides over time. In 1991, ANSI combined the original standards with their

supplements into C78.3­1991 and C78.1­1991, respectively. In 1997, DOE incorporated definitions for fluorescent

lamps into the Code of Federal Regulations (CFR). 62 FR 29238. DOE used the statutory definition, but replaced

“ANSI C78.1­1978 and related supplements” with “ANSI C78.1­1991” and replaced “ANSI C78.3­1978 (R1984)

and related supplement C78.3a­1985” with “C78.3­1991.”

3­2(v) Reflectorized or aperture lamps.

(vi) Fluorescent la mps designed for use in reprographic equipment.

(vii) Lamps primarily d esigned to produce radiation in the ultra­violet region of

the spectrum.

(viii) Lamps with a color rendering index of 87 or greater.” b

As part of this rulemaking, under the authority of 42 U.S.C. 6295(i)(5), DOE is

considering extending coverage to additional general service fluorescent lamps. In the ANOPR

Federal Register notice, DOE considers extending energy conservation standards coverage to the

following list of “additional general service fluorescent lamps”:

• 4­foot, medium b ipin lamps with wattages ≥ 25 and < 28;

• 8­foot recessed double c ontact, rapid start, HO lamps not defined in ANSI Standard

C78.1­1991;

• 8­foot recessed double c ontact, rapid start, HO lamps (other than 0.800 nominal amperes)

defined in ANSI Standard C78.1­1991; and

• 8­foot single p in instant start slimline lamps, with a rated wattage ≥ 52, not defined in

ANSI Standard C78.3­1991.

DOE is a lso considering revising the existing definitions for “rated wattage” and “colored

fluorescent lamp,” as discussed in the ANOPR Federal Register notice.

3.1.1.3 Incandescent Re flector Lamps

Section 321(30)(F) o f EPCA (42 U.S.C. 6291(30)(F)) defines an incandescent reflector

lamp as “a lamp described in subparagraph (C)(ii)” of the definition for incandescent lamp.

Section 321(30)(C) of EPCA (42 U.S.C. 6291(30)(C)) defines “incandescent lamp” as:

“a lamp i n which light is produced by a filament heated to incandescence by an electric

current, including only the following:

(i) Any lamp ( commonly referred to as lower wattage nonreflector general service

lamps, including any tungsten­halogen lamp) that has a rated wattage between 30

and 199 watts, has an E26 medium screw base, has a rated voltage or voltage

range that lies at least partially within 115 and 130 volts, and is not a reflector

lamp.

(ii) Any lamp ( commonly referred to as a reflector lamp) which is not colored or

designed for rough or vibration service applications, that contains an inner

b Section 316(b) of the Energy Independence and Security Act of 2007 amended section 321(30)(B)(viii) of EPCA

(42 U.S.C 6291(30)(B)(viii)) by replacing the exclusion for lamps with a CRI of 82 or greater, with an exclusion of

lamps with a CRI of 87 or greater.

3­3reflective coating on the outer bulb to direct the light, an R, PAR, ER, BR, BPAR

or similar bulb shapes with E26 medium screw bases, a rated voltage or voltage

range that lies at least partially within 115 and 130 volts, a diameter which

exceeds 2.25 inches, and has a rated wattage that is 40 watts or higher.

(iii) Any general s ervice incandescent lamp (commonly referred to as a high­ or

higher­wattage lamp) that has a rated wattage above 199 watts (above 205 watts

for a high wattage reflector lamp).”

As seen a bove in subparagraph (ii) of the definition of “incandescent lamp” contains

several terms that limit scope of IRL. Appendix 3A contains statutory and CFR definitions for

many of these terms. Concerning E26 medium screw bases, DOE will use the definition of

“medium screw base” as added to EPCA in section 135(a)(3) of the Energy Policy Act of 2005

(EPACT 2005), Public Law 109­58. (42 U.S.C. 6291(51)) This defines an Edison screw base

with the prefix E26 as that appearing in the “American National Standard for Electric Lamp

Bases,” ANSI/IEC C81.61–2003, published by the American National Standards Institute. This

version of C81.61 identifies four lamp base (cap) types with a prefix of E26, which are singlecontact medium screw (E26/24), double­contact medium screw (E26d), skirted medium screw

for PAR lamps (E26/50x39), and extended skirted medium screw for R­lamps (E26/53x39).

3.2 MARKET AS SESSMENT

The following m arket assessment:

• identifies the m anufacturer trade association and domestic manufacturers of GSFL

and IRL;

• discusses manufacturer m arket share, regulatory programs, and non­regulatory

initiatives;

• defines product c lasses;

• provides historical s hipment data, shipment projections, and equipment lifetime

estimates; and

• summarizes ma rket performance data.

3.2.1 Trade Association

Th e National El ectrical Manufacturers Association (NEMA) is the trade association of

GSFL and IRL. In addition to lamps, NEMA’s Lighting Systems Division also oversees

products such as ballasts, emergency lighting, lighting controls, luminaires, solid state lighting,

and other emerging lighting technologies. NEMA provides an organization through which

manufacturers of lighting equipment can work together on projects that affect their industry and

business. NEMA’s activities relating to energy efficiency include: 1

3­4• “Advising DO E and executive agencies on lighting research and market transformation

needs

• Participating in the climate change discussions with the Administration and Congress

• Monitoring en ergy­efficiency rulemakings and standards affecting lighting products by

DOE and states

• Promoting the n ational voluntary luminaire rating and information program under the

National Lighting Collaborative

• Supporting ad option of new ASHRAE/IESNA 90.1 lighting provisions

• Advising the D OE Federal Energy Management Program (FEMP) on energy­efficient

lighting recommendations

• Coordinating wi th the DOE and Environmental Protection Agency on Energy Star®

Buildings and Energy Star voluntary product labeling programs.

• Advocating ma rket­based approaches to enhance the use and penetration of energyefficient technologies.”

3.2.2 Manufacturers an d Market Share

Table 3.2.1 l ists NEMA members that manufacture GSFL, IRL, or GSIL. Parent

companies are shown in parentheses, if applicable.

Table 3.2.1 N EMA General Service Fluorescent Lamp and Incandescent Reflector Lamp

Manufacturers

EYE Lighting International of

North America, Inc. (Iwaski

Electric Co. Ltd.) Phillips L ighting ( Royal Philips

Electronics) Venture L ighting I nternational,

Inc. (Advanced Lighting

Technologies, Inc.)

Feit E lectric C ompany. Ruud Lighting I nc. Welch Allyn, I nc.

GE C onsumer a nd Industrial

(General Electric) SLi Lighting ( Sylvania Lighting

International) Westinghouse L i ghting

Corporation, Inc. (Westinghouse

Electric Corp.)

Halco L ighting C orporation Technical Consumer P roducts, Inc.

OSRAM S ylvania ( Siemens USHIO America, I nc. (USHIO

AG). INC)

Table 3.2.2 lists the manufacturers that produce general service fluorescent lamps.

3­5Table 3.2.2 General Service Fluorescent Lamp Manufacturers

AAMSCO Lighting, Inc. Glass Surface S ystems Inc. SLi Lighting

A merican L ighting H alco Lighting C orporation Standard Products Inc.

B ulbrite I ndustries, I nc. Hi­Light Lighting C o. Ltd. Star Lighting P roducts

CCL, I nc. H ybec Corporation S unrise Lighting

D URA L amp I nterlectric Co rporation Super Trend L ighting Ltd.

Duro­Test L ighting, I nc. Iwasaki Electric C o., Ltd Surya Roshni I nc.

e3light LCD L ighting, I nc. Technical Consumer P roducts,

Inc.

EGL C ompany, I nc. LITETRONICS In ternational, Trojan Inc

I nc.

Eiko Lux E lextronic P roducts, Inc. Turolight Inc.

F eit E lectric C ompany OSRAM Sylvania U SHIO America, I nc.

Fulham I nc. P anasonic Corporation o f North Voltarc Technologies, I nc.

America

Full S pectrum S olutions, Inc. Philips Lighting Z hejiang Yankon G roup Co., Ltd

GAL L ighting P romolux Lighting I nternational

GE C onsumer a nd Industrial Shenzhen Shensco P holighting

(General E lectric) T ech Co., L td

Table 3.2.3 lists the manufacturers that produce IRL.

Table 3.2.3 I ncandescent Reflector Lamp Manufacturers

Aero­Tech Light Bulb Co. GAL Lighting P hilips Lighting

A AMSCO L i ghting, Inc. GE Consumer a nd Industrial Shanghai Luxiang L ighting

(General E lectric) C o.,Ltd

American L ighting G lass Surface S ystems Inc. SLi Lighting

B ulbrite I ndustries, I nc. Globe Electric C ompany Inc. Standard Products Inc.

C AST L ighting L LC. Halco Lighting C orporation Sunrise Lighting

C CL, I nc. H i­Light Lighting C o. Ltd. Super Trend L ighting Ltd.

DURA L amp H ybec Corporation S urya Roshni I nc.

Duro­Test L ighting, I nc. Interlectric Co rporation Trojan Inc

e 3light Iwasaki E lectric C o., Ltd Turolight Inc.

E iko Lights o f A ustralia Uninex International

E YE L ighting I nternational of LITETRONICS In ternational, USHIO America, I nc.

North A merica, I nc. Inc.

Feit E lectric C ompany OSRAM Sylvania

Three manufacturers hold the majority of the domestic market share of GSFL and IRL.

These manufacturers are listed below.

• GE Consumer a nd Industrial of General Electric, Inc. (hereafter, “GE)

• OSRAM Sylvania o f Siemens AG (hereafter “Osram”)

• Philips Lighting o f Royal Philips Electronics (hereafter “Philips”)

In addition to l amps listed under this rulemaking, the lighting divisions of all three

companies manufacture other products, such as lamp ballasts, high intensity discharge lamps,

LED lighting, and compact fluorescent lamps (CFL).

3.2.2.1 Small Businesses

3­6Small businesses may be particularly affected by the promulgation of minimum energy

conservation standards for fluorescent and incandescent lamps. The Small Business

Administration (SBA) defines small business manufacturing enterprises for GSFL and IRL as

having 1,000 employees or fewer. 2 SBA lists small business size standards that are matched to

industries as they are described in the North American Industry Classification System (NAICS).

A size standard is the largest that a for­profit concern can be and still qualify as a small business

for Federal Government programs. These size standards are generally the average annual

receipts or the average employment of a firm. For lamps, the size standard is matched to NAICS

code 335110, Electric Lamp Bulb and Part Manufacturing, which has a size standard of 1,000

employees.

DOE will s tudy the potential impacts on these small businesses in detail during the

manufacturer impact analysis, which it will conduct as part of the Notice of Proposed

Rulemaking analysis. Table 3.2.4 lists the small business fluorescent and incandescent reflector

lamp manufacturers that DOE has identified.

Table 3.2.4 S mall Business Manufacturers of General Service Fluorescent Lamps or

Incandescent Reflector Lamps

American Lighting Halco Lighting C orporation Promolux Lighting I nternational

CCL, I nc. H ybec Corporation S tar Lighting P roducts

Duro­Test L ighting, I nc. Interlectric Co rporation Trojan Inc

E GL C ompany, I nc. LCD Lighting, I nc. SLi Lighting

E iko LITETRONICS I n ternational, Inc Voltarc Technologies, I nc.

Full S pectrum S olutions, Inc. Lux Elextronic P roducts, Inc.

3.2.3 Regulatory Pr ograms

DOE is a ware of several Federal and international regulatory programs that affect the

markets for GSFL and IRL. Amendments to EPCA in the Energy Policy Act of 1992

(EPACT1992), P.L. 102­486, established energy conservation standards for GSFL and IRL. (42

U.S.C. 6291(1) and 6 295(i)(1)) In addition, subsequent amendments to EPCA in the Energy

Independence and Security Act of 2007 (EISA 2007), P.L. 110­140, amended the existing

standard for IRL.

The following s ection summarizes U.S. and Canadian regulatory initiatives relevant to

the lamps covered by this rulemaking. While the following discussion is not exhaustive in

describing all regulatory action related to GSFL and IRL, it provides detail on some notable

initiatives that characterize recent developments in the lighting market.

3.2.3.1 Federal Energy C onservation Standards

Table 3.2.5 s hows the Federal standards that regulate 4­foot medium bipin, 2­foot Ushaped, 8­foot single pin slimline, and 8­foot recessed double contact high output general

fluorescent lamps. The standards mandate that lamps manufactured on or after the specified

effective dates must meet the minimum CRI and minimum average lamp efficacy. 42 U.S.C.

3­76295(i)(1); 10 CFR Section 430.32(n)(1)

Table 3.2.5 F ederal Regulations for General Service Fluorescent Lamps

Lamp Type Nominal Lamp

W attage

W Minimum

CR I Minimum Av erage

Lamp Efficacy

lm/W Effective D ate

F our­Foot M e dium Bipin > 35 W 69 75.0 Nov. 1, 1 995

≤ 3 5 W 45 75.0 Nov. 1, 1 995

Two­Foot U ­Shaped > 35 W 69 68.0 Nov. 1, 1 995

≤ 3 5 W 45 64.0 Nov. 1, 1 995

Eight­Foot S li mline > 65 W 69 80.0 May 1, 1 994

≤ 6 5 W 45 80.0 May 1, 1 994

Eight­Foot H ig h Output > 100 W 69 80.0 May 1, 1 994

≤ 1 00 W 45 80.0 May 1, 1 994

Fluorescent lamp ballasts are also regulated at the Federal level. Though they are not

covered by this rulemaking, the ballast on which fluorescent lamps operate affects the systems’

operating characteristics (total system power, lumen output, etc.) and therefore will affect the

analyses DOE conducts. On September 19, 2000, DOE issued a Final Rule establishing energy

conservation standards for ballasts that operate one F40T12 lamp, two F40T12 lamps, two

F96T12 lamps, or two F96T12HO lamps (hereafter referred to as ‘‘the Ballast Rule’’). 65 FR

56740 (Sept. 19, 2000); 10 CFR 430.23(m)(4). This rule bans the fabrication of ballasts that do

not meet these ballast efficacy factor (BEF) requirements as of April 1, 2005. The ban on U.S.

sales by ballast manufacturers to fixture manufacturers took effect July 1, 2005. The ban on U.S.

sales of ballasts in lighting fixtures took effect on April 1, 2006. The ban on U.S. sales of

replacement ballasts begins on July 1, 2010. The regulations provide for some exemptions.

Table 3.2.6 E PCA Standards for Fluorescent Lamp Ballasts

Application for Operation of Ballast Input

V oltage

V Total N ominal

L amp Watts

W Ballast E fficacy

F actor

One F40T12 L amp 120 40 1.805

277 40 1.805

Two F 40T12 L amps 120 80 1.060

277 80 1.050

Two F 96T12 L amps 120 150 0.570

277 150 0.570

Two F 96 T 12 HO Lamps 120 220 0.390

277 220 0.390

Sections 135(a) of EPACT 2005 amended EPCA to set additional requirements for

fluorescent lamp ballasts operating one F34T12 lamp, two F34T12 lamps, two F96T12/ES

lamps, or two F96T12HO/ES lamps (hereafter referred to as “the EPACT 2005 Ballast

Standard”). (42 U.S.C. 6291(29) and 6295(g)(8)(a)) Table 3.2.7 outlines the EPACT 2005

Ballast Standards that DOE codified in the U.S. Code of Federal Regulations. (See 10 CFR

430.32(m)(5)) This standard effectively bans the fabrication of ballasts that do not meet these

BEF requirements as of July 1, 2009. The effective ban on U.S. sales by ballast manufacturers to

fixture manufacturers takes effect October 1, 2009. The effective ban on U.S. sales of ballasts in

3­8lighting fixtures takes effect on July 1, 2010. The ban on U.S. sales of replacement ballasts

begins on October 1, 2010. EPACT 2005 provided some exemptions.

Table 3.2.7 E PACT 2005 Standards for Fluorescent Lamp Ballasts

Application for Operation of Ballast Input

V oltage

V Total N ominal

L amp Watts

W Ballast E fficacy

F actor

One F34T12 L amp 120 34 2.61

277 34 2.61

Two F 34T12 L amps 120 68 1.35

277 68 1.35

Two F 96T12/ES L amps 120 120 0.77

277 120 0.77

Two F 96T12HO/ES L amps 120 190 0.42

277 190 0.42

The Ballast Rule and the EPACT 2005 Ballast Standard effectively end the sale of

magnetic ballasts that operate one F40T12 lamp, two F40T12 lamps, one F34 T12 lamp, two

F34T12 lamps, or two F96T12/ES lamps. Although there are still magnetic ballasts that operate

8­foot recessed double contact HO lamps, these ballasts are both less efficient and more

expensive than their electronic counterparts. 3 Therefore, although the most common ballast

installed in 2012 for T12 lamps are magnetic ballasts, the most common ballast sold after 2012

will likely be electronic T12 or electronic T8 ballasts.

In addition to F ederal energy conservation standards for fluorescent lamps, EPCA also

set Federal energy conservation standards for IRL. (42 U.S.C. 6295(i)(1)) Table 3.2.8 outlines

these standards. EPCA mandated that all lamps manufactured after November 1, 1995 meet six

efficacy requirements. Minimum lamp efficacy varies by nominal lamp wattage. One effect of

these standards is increased use of higher efficacy halogen lamps as a replacement for standard

IRL. EISA 2007 amended EPCA’s definition for incandescent reflector lamp and amended the

standard in 42 U.S.C. 6295(i)(1). Prior to EISA 2007, the statutory definition for IRL excluded

ER and BR shaped lamps and lamps with a diameter less than 2.75 inches. However, EISA

2007, amended this definition to include ER and BR shaped lamps and lamps with diameter

greater than 2.25 inches. EISA 2007 also amended 42 U.S.C. 6295(i)(1) to exempt the following

lamps from the minimum efficacy requirements: (1) lamps rated at 50 watts of less that are

ER30, BR30, BR40, and ER40; (2) lamps rated at 65 watts that are BR30, BR40, or ER40 lamps;

and (3) R20 incandescent reflector lamps rated 45 watts or less.

Table 3.2.8 F ederal Regulations for Incandescent Reflector Lamps

Nominal Lamp Wattage Minimum Av erage Lamp Efficacy

W lm/W

40­50 10.5

51­66 11.0

67­85 12.5

86­115 14.0

116­155 14.5

156­205 15.0

3­93.2.3.2 Canadian En ergy Efficiency Standards

The Natural R esources Canada (NRCan) Office of Energy Efficiency regulates the

energy efficiency of GSFL and IRL in Canada. In 1992, Parliament passed the Energy

Efficiency Act (S.C. 1992, c. 36), which concerns minimum performance levels for energy­using

products, effective February 1995. In November 1995, Canada’s Energy Efficiency Regulations

(SOR/94­651) were amended to include GSFL and some GSIL. An amendment in April 2003

included regulation of selected ER and BR IRL.

Canada’s approach t o the regulation of GSFL closely resembles the U.S. Federal

Efficiency Standard discussed in section 3.2.3.1. The Canadian minimum average CRI and lamp

efficacy levels are identical to those shown in Table 3.2.5. Though there are minor variations in

definition between the U.S. and Canadian standards, they effectively cover the same product.

The Canadian t est procedures refer to a document published by the Canadian Standards

Association (CSA). CSA is an independent standards­setting agency that establishes test

procedures and efficiency standards that are typically adopted by the Canadian government.

Fluorescent lamp test procedure CAN/CSA­C819­95 (2001), entitled Performance of General

Service Fluorescent Lamps

, references applicable ANSI, CIE, and IES standards.

Canada’s approach t o regulating IRL differs from the U.S. approach. Similar to the

United States, Canada covers R, PAR, and lamps with similar bulb shapes. However, Canada

also regulates selected ER and BR lamps. The Energy Efficiency Regulations of Canada apply

to three categories of IRL: general service incandescent reflector lamps, BR lamps, and ER

lamps. A “general service incandescent reflector lamp” is defined as an:

“Incandescent re flector lamp

“a. with an R bulb shape, a PAR bulb shape or a bulb shape similar to R or PAR that

is neither ER nor BR, as described in ANSI C79.1,

b. with an R bulb shape, a PAR bulb shape or a bulb shape similar to R or PAR that

is neither ER nor BR, as described in ANSI C79.1,

c. with a n ominal voltage or voltage range that lies at least partially between 100

volts and 130 volts,

d. with a d iameter greater than 70 mm (2.75 inches), and

e. that has a nominal power of not less than 40 W and not more than 205 W,

but does not include:

f. a coloured i ncandescent reflector lamp, or

g. an incandescent r eflector lamp that

i) is of the rough or vibration service type with:

(A) a C­11 f ilament, as described in the IES Handbook, with five supports

exclusive of lead wires,

(B) a C­17 f ilament, as described in the IES Handbook, with eight supports

exclusive of lead wires, or

(C) a C­22 f ilament, as described in the IES Handbook, with 16 supports

exclusive of lead wires,

(ii) is of t he neodymium oxide type and has a lens containing not less than 5%

neodymium oxide,

3­10(iii) has a c oating or other containment system to retain glass fragments if the

lamp is shattered and is specifically marked and marketed as an impact­resistant

lamp,

(iv) is specifically m arked and marketed for plant growth use and has a spectral

power distribution that:

(A) is different f rom that of the lamps described in paragraphs (a) to (e), and

(B) contains a f ilter that suppresses yellow and green portions of the spectrum,

or

(v) is specifically m arked and marketed

(A) as an i nfrared heat lamp,

(B) for heat­sensitive u se,

(C) for mine u se,

(D) for marine, a quarium, terrarium or vivarium use, or

(E) for airfield, a ircraft or automotive use.”

BR lamps a re defined as:

“Incandescent re flector lamp as described in ANSI C79.1, but does not include any of

those lamps that have

a. a diameter o f 95.25 mm (BR30) and a nominal power of less than 66 W,

b. a diameter o f 92.5 mm (BR30) and a nominal power of 85 W, or

c. a diameter o f not less than 120.65 ,mm(BR38) but not more than 127 ,mm (BR40)

and a nominal power of less than 121 W.”

ER lamps a re defined as incandescent reflector lamps as described in ANSI C79.1. Table

3.2.9 shows the C anadian energy conservation standards for IRL. In addition to the referenced

ANSI documents in the definitions, the Canadian test procedures reference CAN/CSA­C862­01,

Performance of Incandescent Reflector Lamps

. The standards became effective on April 1, 1996

for GSFL and IRL and on January 1, 2003 for additional ER and BR lamps.

Table 3.2.9 C anadian Energy Efficiency Regulations for Incandescent Reflector Lamps

Rated Wattage

W Minimum Av erage Lamp Efficacy

lm/W

ER L amps

5 0 7.0

75 6.5

120 10.0

R, P AR, B R Lamps, and ER Lamps Not Covered Above

40­50 10.5

51­59 11.0

60­85 12.5

86­115 14.0

116­155 14.5

156­205 15.0

In November 2006, NRCan published a bulletin proposing to amend Canada's Energy

Efficiency Regulations. NRCan proposed testing and labeling requirements for light output,

input wattage, and rated lifetime for GSFL, medium base, integrally ballasted CFLs, and

3­11reflector and non­reflector GSIL. 4 The bulletin also proposed a definition for non­reflector

GSIL:

3.2.4 Non­Regulatory In itiatives

DOE reviewed s everal national, regional, and local voluntary programs that promote the

use of energy­efficient lighting in the United States. FEMP’s program for energy­efficient

lighting, the Consortium for Energy Efficiency (CEE)’s High Performance Commercial Lighting

Initiative, the Energy Efficient Commercial Buildings Deduction, and the Northeast Energy

Efficiency Partnership (NEEP) are a few examples. The following section summarizes some of

these programs for the lamps covered by this rulemaking. While it is not an exhaustive, the

discussion provides detail on some notable initiatives that characterize recent developments in

the lighting market.

3.2.4.1 Federal Energy M anagement Program

FEMP helps F ederal buyers identify and purchase energy­efficient products including

certain GSFL. Section 161 of EPACT 1992 encourages energy­efficient Federal procurement.

Executive Order 12902 and FAR section 23.704 direct agencies to purchase products in the

upper 25 percent of energy efficiency. As Table 3.2.4 shows, FEMP provides recommendations

of total light output (in lumens) and the best available models at the time of publishing. 5 FEMP

offers buyers support tools such as efficiency guidelines, cost­effectiveness examples, and a cost

calculator. FEMP also offers training, on­site audits, demonstrations, and design assistance.

Table 3.2.10 F ederal Energy Management Program Efficiency Recommendation

Lamp Type Recommended Best Available

F our­Foot T 8, 3 2W 2,800 lumens or m ore 3,000 lumens

F our­Foot T 12, 3 4W 2,800 lumens or m ore 2,900 lumens

E ight­Foot T 8

, 59W 5,700 lumens or m ore 5,950 lumens

E ight­Foot T 1 2, 60W 5,600 lumens or m ore 6,000 lumens

T 8/U, 3 1­32w 2 ,600 lumens or m ore 2,850 lumens

T 12/U, 3 4w 2 ,700 lumens or m ore 2,760 lumens

3.2.4.2 Consortium fo r Energy Efficiency

CEE has b oth a Residential Lighting Initiative and a High­Performance Commercial

Lighting Initiative. The Residential Lighting Initiative primarily promotes high efficiency

fixtures and CFLs, neither of which is covered under this rulemaking. The purpose of CEE’s

High­Performance Commercial Lighting Initiative is to define what constitutes “high

performance,” and the initial efforts have focused on efficient T8 lighting products. On May 1,

2007, CEE updated its specification for high­performance T8 lamps as a T8 lamp not greater

than 32W with a minimum initial lamp lumens of 3,100 lumens or greater. 6 On January 23,

2007, CEE released its specification for reduced­wattage T8 lamps as a lamp of 25W or 28W

with minimum initial lumen output greater than or equal to 2,585 lumens or 2,400 lumens,

respectively. 7

3.2.4.3 Energy Efficient C ommercial Building Deduction

3­12EPACT 2005 created the Energy Efficient Commercial Buildings Deduction (26 U.S.C

179D), which establishes a tax deduction for building owners who incur expenses for energy

efficiency upgrades. Effective for property in service from January 1, 2006 through December

31, 2008, the deduction allows partial deductions for improvement in interior lighting. Though

the statute does not specify required lamp types or efficacies, it does call for an overall reduction

in lighting power density, encouraging the use of higher performance and reduced­wattage

GSFL.

3.2.4.4 Northeast En ergy Efficiency Partnerships

Northeast Ene rgy Efficiency Partnerships (NEEP) is a regional nonprofit organization

that promotes energy efficiency in the Northeast. NEEP currently runs a High Efficiency

Commercial Lighting Initiative to “achieve cost­effective energy and demand by overcoming

market barriers to the availability and widespread market adoption of advanced T8 fluorescent

lighting systems.” 8 NEEP coordinates with multiple local and state governments, utilities, and

other initiatives, such as Efficiency Vermont and the Long Island Power Authority, to promote

efficient lighting products. Efficiency Vermont offers technical assistance and financial

incentives to encourage energy efficiency in Vermont. This organization offer rebates of $15 for

the installation of “Super T8” lamp­and­ballast systems. It also provides a custom rebate for

reduced­wattage T8 lamps. 9 The Long Island Power Authority is a non­profit municipal electric

utility that serves the Long Island area. It provides rebates for high­performance T8 systems and

T5 fixtures ranging from $10 to $35. 10

3.2.5 Historical Sh ipments

Awareness of annual product shipment trends is an important aspect of the market

assessment and the development of the standards rulemaking. For this rulemaking, DOE

received from NEMA historical shipments from 2001 to 2005 of GSFL and IRL. 11 DOE used

this data for three main purposes. First, the shipment data and market trend information

contributed to the shipments analysis and base­case forecast for GSFL and IRL (see Chapter 9).

By using recent shipment data and expert opinion on market trends, DOE believes that the

shipments model and base­case forecasts are based on a sound dataset. Second, DOE used the

data to select the representative product classes and representative units for analysis. Generally,

DOE selected representative product classes and units for analysis to reflect the highest volume,

most common lamp types and wattages used in the United States today (see Chapter 5). Third,

DOE used these data to develop the market share matrices for the national impact analysis (see

Chapter 10). Based on its understanding of trends in the market, DOE estimated how the market

would respond to the various candidate standard levels.

For GSFL, t he historical shipment data is broken down by lamp length (2­foot, 4­foot, and

8­foot), diameter (T12 and T8), shape (linear and U­shaped), and lumen output (regular or high

output (HO)). Four­foot medium bipin lamps constitute the vast majority of GSFL sales. These

are followed in order of unit sales by 8­foot single pin slimline lamps and 8­foot recessed double

contact HO lamps, which together constitute under a quarter of GSFL sales. Four­foot medium

bipin, 8­foot single pin slimline, and 8­foot recessed double contact HO lamps are the most

common GSFL. Shipments of 2­foot U­shaped lamps account for under 5 percent of GSFL unit

sales historically.

3­13GSFL in the categories of 4­foot medium bipin, 8­foot single pin slimline, and 2­foot Ushaped lamps are primarily used in the commercial sectors. As Table 3.2.11 shows, 4­foot

fluorescent lamp shipments show a clear decrease in the T12 market share and an increase in the

T8 market share. These shipments, coupled with information obtained from NEMA and

manufacturers, suggest that consumers are moving away from 4­foot T12 fluorescent lamps and

toward 4­foot T8 fluorescent lamps. This trend is reflected both in the popularity of T8 lamps in

new construction and in lighting system retrofits and renovations where the ballast is replaced.

The vast majority of 4­foot T12 ballasts are magnetic, while the vast majority of 4­foot T8

ballasts are electronic. This decline of 4­foot T12 shipments will most likely be compounded in

2010 when new energy conservation standards for fluorescent ballasts, including replacement

F40T12 ballasts and new F34T12 ballasts, go into effect. (See 10 CFR 430.32(m)(4)(ii) and

430.32(m)(5)­(6)) For 4­foot F40 T12 and F34T12 lamps, discussions with manufacturers

suggest that they anticipate their customers will shift to T8 counterparts instead of T12 lamps

that operate with electronic ballasts.

Table 3.2.11 N EMA Shipments of Four­Foot General Service Fluorescent Lamps

Unit Sales by Year

thousands

2001 2002 2003 2004 2005

T12 F our­Foot M edium Bipin 212,564 205,998 181,931 175,850 162,664

T8 F our­Foot M edium Bipin 164,129 163,632 172,294 195,698 215,530

Total F our­Foot M edium Bipin 376,593 369,630 354,225 371,548 378,194

As Table 3.2.12 shows, historical shipments of 8­foot GSFL reflect a decline in

shipments of 8­foot T12 lamps and an increase in shipments of 8­foot T8 lamps. However, this

increased market share in 8­foot T8 lamps does not sufficiently compensate for the decreased

shipments of 8­foot T12 lamps. Discussions with NEMA, manufacturers, and lighting experts

suggest that a portion of the 8­foot T12 market is being transferred to the 4­foot T8 market.

However, because the lumen output from a conventional 8­foot lamp­and­ballast system is

significantly higher than that of a 4­foot lamp­and­ballast system, it is likely that one 8­foot

system containing two lamps will be replaced by two 4­foot systems, each containing two lamps.

It is therefore possible that any standard affecting shipments of T12 8­foot single pin slimline

GSFL may also notably affect the shipments of T8 4­foot medium bipin GSFL.

Table 3.2.12 N EMA Shipments of Eight­Foot Single Pin Slimline General Service

Fluorescent Lamps

Unit Sales by Year

thousands

2001 2002 2003 2004 2005

T12 E ight­Foot S ingle Pin Slimline 43,265 41,443 37,170 36,263 33,636

T8 E ight­Foot S ingle Pin Slimline 4,405 5,300 5,183 5,727 5,176

Total E ight­Foot S ingle Pin Slimline 47,670 46,743 42,353 41,990 38,812

Table 3.2.13 shows the historical shipments of 2­foot U­shaped GSFL. While no clear

trend can be seen in the market share progression of U­shaped T12 and T8 lamps, the market

share of U­shaped lamps is small compared to that of 4­foot medium bipin and 8­foot single pin

slimline lamps.

3­14Table 3.2.13 NEMA Shipments of Two­Foot U­Shaped General Service Fluorescent Lamps

Unit Sales by Year

thousands

2001 2002 2003 2004 2005

T12 T wo­Foot U ­Shaped 9,672 9,314 9,460 7,014 8,839

T8 T wo­Foot U ­Shaped 8,014 6,784 7,018 9,224 8,659

Total T wo­Foot U ­Shaped 17,686 16,098 16,478 16,238 17,496

While 4­foot medium bipin, 8­foot single pin slimline, and 2­foot U­shaped lamps are

primarily used in the commercial sector, 8­foot high output lamps are primarily used in the

industrial sector for applications such as high­bay lighting. Discussions with experts and

manufacturers indicate that most of the recessed double contact HO lamps currently sold are

used with electronic ballasts. The market share of 8­foot recessed double contact HO is

relatively small compared to that of 4­foot medium bipin and 8­foot single pin slimline lamps.

As seen in NEMA’s shipments data, T12 8­foot recessed double contact HO lamps have the

majority of the recessed double contact HO market. Discussions with lighting experts and lamp

manufacturers indicate that they expect any migration of the 8­foot recessed double contact HO

market to go toward T5 fluorescent lamps and metal halide lamps.

Table 3.2.14 N EMA Shipments of Eight­Foot High Output General Service Fluorescent

Lamps

Unit Sales by Year

thousands

2001 2002 2003 2004 2005

T12 E ight­Foot R ecessed Double Contact HO 23,887 24,398 24,206 24,591 25,442

T8 E ight­Foot R ecessed Double Contact HO 691 647 467 674 420

Total E ight­Foot R ecessed Double Contact HO 24,578 25,045 24,673 25,265 25,862

IRL are primarily used in the commercial and residential sectors. Based on interviews

with lighting experts, DOE estimates that approximately 80 percent of halogen IRL are used in

the commercial sector and 20 percent are used in the residential sector. DOE also estimates that

20 percent of the incandescent (i.e., non­halogen) reflector lamps are used in the commercial

sector, and that the balance (80 percent) is used in the residential sector. As Table 3.2.15 shows,

historical shipment data indicates that the total market share of halogen IRL is growing.

However, its slow rate of growth suggests either that the market has reached near equilibrium or

that competing incandescent IRL are successfully gaining market share and new installation

opportunities. The shipment data in Table 3.2.15 reflects this trend, indicating comparatively

large growth among non­halogen IRL, in contrast to the relatively flat growth for halogen IRL.

3­15Table 3.2.15 NEMA Shipments of Incandescent Reflector Lamps

Unit Sales by Year

thousands

2001 2002 2003 2004 2005

PAR Incandescent 8,900 6,697 5,090 5,308 15,018

R Incandescent 89,465 96,218 103,407 111,720 124,641

PAR 38 H alogen 4 0,804 45,938 45,673 49,937 46,329

PAR 30 a nd P AR 20 Halogen 32,523 27,128 30,506 35,567 39,985

Total I ncandescent R eflector Lamps 171,692 175,961 184,676 202,532 225,973

3.3 TECHNOLOGY ASSESSMENT

The purpose o f the technology assessment is to develop a preliminary list of technologies

that could be used to improve the efficacy of GSFL and IRL. The following assessment provides

brief descriptions of the basic construction and operation of each lamp type, followed by a

discussion of technology options to improve the efficacy of that lamp type.

3.3.1 General Service F luorescent Lamps

The fluorescent l amp is a low pressure gas discharge source. The lamp consists of a glass

bulb or tube, filled with low pressure mercury vapor and inert gas, with electrodes sealed onto

both ends of the tube. An arc, in the form of primarily ultraviolet (UV) radiation, is produced by

current flowing between the two electrodes. The phosphors coating the bulb’s inner wall then

absorb this UV radiation and emit light in the visible spectrum. The fluorescent lamp has five

major components in its construction: bulb, electrodes, base, gas fill, and phosphors.

Fluorescent la mp bulbs can be manufactured in a variety of shapes and sizes. The GSFL

lamps in this rulemaking include 4­foot and 8­foot linear lamps and 2­foot U­shaped lamps.

Changing the shape of the lamp can alter the overall efficacy as the lamp may require a different

voltage to maintain the discharge and UV radiation. In addition, the length of a lamp also

influences it efficacy. As Figure 3.3.1 shows, the greater the length, the higher the efficacy,

since losses associated with the electrodes are essentially constant. Therefore, a longer arc

length will have less electrode power loss relative to the total losses. However, because different

lamp shapes and lengths may provide different utility to the consumer and also depend on the

lighting fixture, DOE is not considering these properties as technology options. Rather, as

indicated in the discussion of product classes in Section 3.4, product classes differentiate lamps

by their shape and length.

3­16Figure 3.3.1 Lamp Length Effects on Efficacy

Source: IESNA Lighting Handbook: Reference & Application 12

Two electrodes are hermetically sealed to both ends of the bulb. The electrodes are

usually constructed from coiled tungsten wires coated with a mixture of alkaline oxides. A base

provides an electrical connection to these electrodes and also supports the lamp. Depending on

the start method and operational properties of the lamp (e.g., dimming, wattage, etc.), lamp

designs may use different bases such as single pin, medium bipin, and recessed double contact.

In its analysis, DOE determined that base type and size has little to no effect on efficacy and

therefore did not consider these as technology options. Once voltage is applied to the electrodes,

the tungsten coil and coatings emit large quantities of electrons when the coating is at the proper

temperature (1,000–1,300 K). These electrons then collide with gaseous mercury atoms, exciting

electrons within those atoms. As the electrons decay to their stable or ground state, they emit

ultraviolet radiation primarily at 254 nanometers (nm). In addition to the mercury vapor, an inert

gas or a combination of gases is added to the lamp primarily to moderate the collisions of

mercury ions and minimize evaporation of the electrode coating. As discussed above, the UV

radiation is then absorbed by the phosphors and reemitted as light.

A fluorescent la mp must be operated in series with a current­limiting device, which is

usually a magnetic or electronic ballast. Each ballast has an associated BF that affects the total

light output of the fluorescent lamp. In addition to limiting current, ballasts also supply starting

and operating voltages required by the lamp. Some ballasts also preheat the electrodes before

initiating the arc. Magnetic fluorescent lamp ballasts use a variety of starting methods, including

preheat start, instant start, or rapid start. c Electronic ballasts can also use a variety of starting

In the preheat start method, usually used with bipin bases, a current passes through both electrodes in series,

heating them. A thermal switch then opens to apply a voltage applied across the lamp and induces the arc. Instant

starting, usually used with a single pin base and with no heating of the electrodes, involves a high voltage (400V to

1,000V) applied across the lamp. This voltage causes the ejection of electrons from the electrodes, creating the arc

discharge. The arc current subsequently heats the electrodes. Rapid start lamps, operating on a bipin base, can also

be instant started and operate similarly. However, in rapid start, the electrodes are continuously actively heated

during operation by passing a small current to each of the electrodes while maintaining a voltage difference across

the lamp.

3­17 cmethods, including instant start, rapid start, and programmed start. d Because different starting

methods result in changes in lamp efficacy, the test procedure for GSFL requires that the efficacy

of each lamp is measured using a common starting method and ballast. However, DOE

considers different starting methods in its analysis. For example, DOE pairs base case 4­foot

T12 medium bipin lamps with magnetic, rapid­start ballasts, and base case 4­foot T8 medium

bipin lamps with electronic, instant­start ballasts. Magnetic and electronic ballasts are also

available in a variety of lamp­per­ballast designs. For example, electronic ballasts are typically

manufactured in 1­, 2­, 3­, and 4­lamp versions.

In discussing e ach of the following technology options, it is important to note that the

efficacy of a lamp, in lumens per watt (lm/W), can be affected in two major ways. One method

is by affecting the total light output at a given wattage. This generally refers to changing the

spectral output of the lamp to result in a larger overlap with the spectral eye sensitivity. e The

second method of changing lamp efficacy is requiring a different electrical wattage input to

maintain a given lumen output. This method involves tweaking the processes that convert

electrical energy to visible radiation.

3.3.1.1 Highly Emissive E lectrode Coatings

Fluorescent la mp electrodes are generally tungsten filaments coated with a mixture of

alkaline earth oxides. The purpose of the electrodes is to emit a sufficient number of electrons to

ionize the gas and maintain the lamp discharge. Therefore, any improvement in electrode

coating that would allow electrons to be more easily removed from the electrodes would reduce

the lamp power and increase the overall efficacy of the lamp. This technology option essentially

addresses the efficiency of the conversion of electrical input power to visible radiation. As

electrons are more easily emitted from the electrodes, a lower voltage is needed to maintain the

arc. Conventional emissive coatings include barium oxide (BaO), calcium oxide (CaO), and

strontium oxide (SrO). In addition to raising efficacy, the electrode coatings can result in an

increased lamp lifetime. Without sufficient electron emission from the electrode, a large voltage

gradient is created in front of the electrode during the cathode cycle, which is emitting negatively

charged ions and receiving positively charged ions. This high electric field accelerates these ions

into the electrode at a high velocity, causing electrode damage. The damage shortens the

lifetime of the lamp. Additional materials have been mixed with existing conventional oxides to

coat fluorescent lamp electrodes. These materials include zirconium oxide (ZrO), which extends

lamp lifetime, and silicon carbide (SiC), which more effectively removes electrons from the

electrode.

3.3.1.2 Higher Efficiency Lamp F ill Gas Composition

Fluorescent la mps contain mercury vapor, which when ionized produces UV radiation.

They also contain a rare gas or combination of gases to facilitate ignition. These “lamp fill

gases” affect the mobility of the mercury ions and electrons in the lamp plasma based on their

d Programmed start ballasts delay the starting voltage until the electrodes are heated to an optimum temperature.

Then, they may reduce the voltage on the electrodes.

e A “lumen” is a measurement of the radiometric energy emission from a light source weighted by the response

function of a human eye, called the photopic spectral luminous efficiency function, V(λ). See Figure 3.3.4 for a

graph if this function.

3­18molecular weight. Lower molecular weight gases generally result in higher lamp efficacy. As

lighter gases are used, the mobility of mercury ions and electrons increases, allowing them to

reach greater velocities. This causes a rise in electron temperature of the plasma, facilitating

recombination and ultimately raising the UV radiation to saturation level. However, if the

mobility of the ions and electrons exceeds a certain optimal point, they are then able to reach the

lamp glass surface, which prevents emission and effectively reduces UV output.

Standard lamps g enerally use argon gas. Energy­saver lamps may use a mixture of

krypton and argon. In addition, neon and xenon are sometimes blended with argon. As Figure

3.3.2 shows, given a linear power density of 25 watts/foot (W/ft), both neon and argon result in

similar UV radiation. However, given a high linear power density of 50 W/ft, neon clearly

allows for higher UV radiation, and therefore higher efficacy.

Figure 3.3.2 Lamp Fill Gas Effect on UV Output for T12 Lamps

Source: Electric Discharge Lamps 13

These gases are usually at low pressures, ranging from 100 to 400 Pascals. As the

pressure exceeds a certain point, elastic scattering increases, decreasing the mobility of the ions

and electrons. This decreased mobility lowers the total UV radiation of the lamp, thereby

decreasing lamp efficacy. Because fluorescent lamp ballasts are often current­controlled

devices, the use of higher efficiency lamp fill gases, such as krypton, results in lower power.

These lower power lamps, often called energy­saver lamps, have some restrictions of usage, such

as operation in less than 60 degree Celsius ambient temperature, with reduced current ballasts,

and with rapid­start ballasts, etc.

Lamp fill g as composition can also affect lamp lifetime due to collisions between the

lamp fill gas and the evaporated electrode coatings. As discussed earlier, one common emissive

coating used on electrodes is barium oxide. During lamp operation the barium oxide coating

slowly evaporates from the surface of the electrode. However, some of these escaped barium

atoms then collide with the lamp fill gas, propelling them back toward the electrode and

redepositing them. As Figure 3.3.3 shows, the relative thermionic emission for the cathode, a

measure of the number of electrons emitted, is much greater for a larger molecular weight gas

such as krypton than for a lighter gas such as neon. This is because a larger mass atom can more

effectively collide with and change the trajectory of the barium atoms, providing a lower

3­19diffusion rate of the barium atoms away from the electrode. This redeposition of the electrode

coating results in a longer lamp lifetime.

Figure 3.3.3 Lamp Fill Gas Effect on Thermionic Emission for T12 Lamps

Source: Electric Discharge Lamps 14

3.3.1.3 Higher Efficiency Phosphors

A s described e arlier, the main purpose of phosphor in a fluorescent lamp is to absorb the

UV radiation and reemit it as visible radiation. Therefore, one method of improving lamp

efficacy is to increase phosphor efficiency. This can be done by increasing the phosphor’s UV

absorption or by increasing its emission of radiation in the visible spectrum. Lamp efficacy can

also be improved by increasing the thickness of the phosphor layer, also called phosphor weight.

Typically, there a re efficiency losses in the phosphor’s conversion of UV radiation to

visible radiation, or light. Some of these losses are related to the extent to which the phosphors

emit light in the visible spectrum (i.e., radiation with wavelengths between 400 to 750

nanometers (nm)) and the extent that they radiate at visually sensitive wavelengths.

The human e ye does not have the same level of sensitivity to all wavelengths of light.

For example, the eye is highly sensitive to light emission around 550 nanometers (nm), but less

sensitive to emission at 450nm or 650nm. The photopic luminous efficiency function, V(λ),

represents the response function of the human eye to light. Figure 3.3.4 depicts V(λ).

3­20­ 0.2 0.4 0.6 0.8 1.0 1.2Relative Sensitivity

400 450 500 550 600 650 700 750

Wavelength (nanometers)

Figure 3.3.4 Human Eye Photopic Spectral Luminous Efficiency Function, V(λ)

Lumens, used t o calculate lamp efficacy, measures the radiometric energy emission from

a light source weighted by the response function of the human eye, V(λ). Therefore, the specific

wavelengths that a lamp emits will affect the lamp’s calculated efficacy. In other words, because

the human eye is less responsive to certain wavelengths of light, such as those in the blue

spectrum, those lamps that contain these less sensitive wavelengths will have lower efficacies.

As such, every watt of radiometric energy emitted from a fluorescent lamp is not equal under a

lumen­per­watt metric.

The spectral p ower distribution (SPD) of light emitted from a lamp characterizes the

amount of power radiated at each wavelength in the visible spectrum. Figure 3.3.5 illustrates a

sample SPD. It is apparent that the light source emits more radiation at certain wavelengths than

others.

3­21Figure 3.3.5 Sample Power Spectrum Distribution

Source: www.gelighting.com 15

This SPD determines the color correlated temperature (CCT) and the color rendering

index (CRI), both important properties for measuring the color quality of light. CRI, a single

value with no units, is a measure of the color rendering properties of a light source, or the ability

of a light source to show the “true” color of an object as compared to a reference source. f16 The

maximum CRI is 100. Lower CRI values indicate greater variation in an object’s apparent color

compared to when lit by the reference source. CCT, a single value with units of degrees Kelvin

(K), is a measure of the color appearance of light emitted from a lamp. gh17 Lower CCT values

correspond to warmer light, with more red content in the spectrum, and higher CCTs correspond

to cooler light, with more blue content. As the spectral emission from the lamp is modified to

change the CCT, the light emitted often contains more red or blue light.

Given the s hift in the wavelengths of light emitted from lamps with different CCTs, and

the fact that lumens account for the amount of light emitted at particular wavelengths, the

efficacy of lamps with different CCT can all vary. For lamp spectra with very high or very low

CCTs, the spectral emission of the lamp will not be tuned to the photopic luminous efficiency

function V(λ) for maximum luminous efficacy. Therefore, in principle, CCTs lower than about

3,000K and higher than about 5,000K will be less efficacious than those between 3,000K and

f According to the IESNA Lighting Handbook, the CRI of a light source is “a measure of the degree of color shift

objects undergo when illuminated by the light source as compared with those same objects when illuminated by a

reference source of comparable color temperature.”

g According to the IESNA Lighting Handbook, the CCT of a light source is “the absolute temperature of a

blackbody whose chromaticity most nearly resembles that of the light source.”

h While CCT is a single value, light with the same CCT value may have slightly different properties. Therefore, the

lighting industry has defined elliptical regions in chromaticity space (called 4 MacAdam color steps) for specific

CCT values (e.g., 2,700K, 3,000K, 3,500K, 4,000K/4,100K, 5,000K, and 6,500K) in ANSI C78.376­2001. These

regions act as a tolerance for the color properties of the lamp.

3­225,000K. Figure 3.3.6 illustrates the difference in average efficacy between 32W T8 4­foot

medium bipin GSFL with different CCTs (and other attributes equivalent).Efficacy(lms/W) 92

90

88

86

84

82

80

78

6,500K 4,100K

CCT

Figure 3.3.6 Average Efficacies of Lamps with a CCT of 6,500K versus 4,100K

Different types o f phosphor emit light with different SPDs, and the choice of phosphor or

blend of phosphors greatly affects the color of the lamp. There are two groupings of phosphors:

halophosphors and rare­earth phosphors (often called tri­phosphors). Initially, halophosphors,

typically composed of group 17 elements from the periodic table of elements, were

predominantly used in fluorescent lamps. Then, in the late 1980s, rare­earth phosphors, which

are generally considered to have higher phosphor efficiencies, better color rendering properties,

and improved lumen maintenance, were integrated into the lamps. Many fluorescent lamps now

use three narrow­band, rare­earth phosphors that emit light in the short, middle, and long

wavelength ranges of the visible spectrum. As Figure 3.3.7 shows, the introduction of these

three­band lamps resulted in a marked increase in efficacy. However, because rare­earth

phosphors are considerably more expensive, longer length and larger diameter lamps commonly

coat the bulb walls with two phosphor layers: a less expensive halophosphor layer and a rareearth phosphor layer. This maintains the SPD of the rare­earth phosphor while keeping cost

relatively low. While some phosphors may be inherently more efficient than others, the most

efficient ones cannot always be selected. Since the choice of phosphor or blend of phosphors

greatly affects the illumination color of the lamp, a high efficiency phosphor may not have

acceptable color properties.

3­23Figure 3.3.7 Lamp Efficacies for Halo­ and Rare­Earth Phosphors

Source: Phosphor Handbook 18

DOE has observed that higher­efficiency phosphors on the market typically offer higher

CRIs. While CRI is not necessarily positively correlated to efficacy, the majority of phosphors

offered in the market currently are. Typically lamps with a CRI in the 60s use only less efficient

halophosphors, while lamps with a CRI in the 70s (700­series phosphor) and in the 80s (800­

series phosphor) use more efficient rare­earth phosphors.

Apart from t he type of phosphor used in a lamp, the thickness of the lamp’s phosphor

coating also affects lamp efficacy. Generally, as phosphor thickness increases, lamp light output

increases until it slightly decreases or stays flat. Figure 3.3.8 illustrates this point, where coating

weight is indicative of phosphor thickness.

Figure 3.3.8 Light Output versus Phosphor Thickness

Source: Journal of the Electrochemical Society 19

3­243.3.1.4 Glass Coatings

To increase t he UV absorption by the phosphors, the bulb glass can be covered with an

antireflective coating. This coating is a refractory oxide, such as aluminum oxide (Al 2 O 3 ), silicon

oxide (SiO 2 ), and titanium oxide (TiO 2 ). This layer is used to reflect any UV radiation that

passes through the phosphor back onto the phosphor, allowing a greater portion of UV to be

absorbed. As the phosphors absorb more UV radiation, they will emit more visible light, thereby

increasing the overall efficacy of the lamp. When these coatings are used with rare­earth

phosphors, a good CRI can be achieved while minimizing the phosphor thickness necessary to

absorb maximum UV radiation.

3.3.1.5 Higher Efficiency Lamp D iameter

Similar to l amp length, lamp diameter is another design parameter of a fluorescent lamp

that can affect efficacy. Though both length and diameter often depend on the ballast and fixture

in which the lamp is being installed, some manufacturers are trying to allow for variance in the

diameter for certain fixtures. As discussed in section 3.4, product classes are not segregated by

lamp diameter. Therefore, DOE considers lamp diameter a technology option to increase

efficacy.

As Figure 3 .3.9 shows, there exists an optimum design diameter for a specific fluorescent

lamp type resulting from two opposing effects. First, in small diameter lamps, an increase in

diameter decreases the number of electrons and mercury ions that recombine at the bulb wall and

produce no light. This lessening of non­radiative recombination results in an increase of optical

power output and subsequently a rise in lamp efficacy. However, when the lamp diameter is

sufficiently large as to result in minimal non­radiative recombination, a second opposing effect

begins to influence the efficacy­diameter relation. With these larger diameter lamps, a further

enlargement in diameter causes a greater imprisonment of radiation within the lamp. As the total

light output is reduced, the lamp efficacy declines as well. In addition to affecting lamp efficacy,

changing the lamp diameter alters the inner surface area of the fluorescent tube. With a larger

diameter and therefore surface area, more phosphor is needed to coat the glass, subsequently

increasing the cost of the lamp.

3­25Figure 3.3.9 Bulb Diameter versus Efficacy

Source: IESNA Lighting Handbook: Reference & Application 12

3.3.1.6 Multi­Photon Ph osphors

The use o f multi­photon phosphors, or quantum­splitting phosphors, can significantly

improve lamp efficacy. Because these phosphors emit more than one visible photon for each

incident ultraviolet photon, a lamp would be able to emit more light for the same amount of

power. Development of this technology remains in the research phase.

3.3.2 Incandescent Re flector Lamps

An incandescent l amp is a light source in which an electrical current passes through a

filament, thermally exiting electrons which then radiate energy in the form of light and heat.

Incandescent lamps consist of a bulb, generally composed of glass such as regular lead, soda

lime, or borosilicate heat­resisting glass. Sealed to the bulb of the covered GSIL is an E26

medium screw base. Within the bulb, an incandescent lamp contains a filament, filament

supports, and sometimes a lamp fill gas. Though early incandescent lamps often used carbon,

osmium, and tantalum filaments, current lamps generally use tungsten filaments. Tungsten’s low

vapor pressure and high melting point allows for high operating temperatures, and consequently

high lamp efficacies. The lamp fill gas, though not included in all incandescent lamps, is used to

extend the lifetime of the lamp.

IRL are i ncandescent lamps with a reflective coating, most commonly composed of

aluminum or silver applied directly to part of the bulb surface. By improving directional

lighting, reflector lamps place the same illuminance on a specific area with reduced watts. The

most common bulb shapes of reflector lamps are reflector (R), parabolic reflector (PAR), bulged

reflector (BR), and elliptical reflector (ER). R­shaped lamps are primarily for indoor

applications, while PAR lamps are usually used outdoors. IRL can be spot floods or floods.

Flood IRL, which provide a greater distribution of light, typically have a beam spread of 16 to 40

degrees. Spot IRL have a beam spread from 9 to 16 degrees.

3­26The following assessment is a discussion of technology options to improve the efficacy

of IRL. In discussing methods to affect the efficacy of an incandescent lamp, it is important to

recognize the interrelation of a lamp’s wattage, luminous output, and lifetime. Often the most

efficacious incandescent lamps have very low lifetimes and therefore become useless to the

consumer. An indirect method to increase overall efficacy involves increasing lifetime. With a

longer lifetime, a more efficacious lamp can be manufactured and will still have utility to the

consumer.

3.3.2.1 Higher Temperature O peration

In the op eration of an incandescent lamp, a current is passed through a tungsten filament,

which when heated, emits light. However, an incandescent light source’s spectrum does not fall

exclusively in the visible region of the electromagnetic spectrum, shown in Figure 3.3.10. By

operating the filament at higher temperatures, the spectral output shifts to shorter wavelengths,

increasing its overlap with the photopic spectral eye sensitivity. This, in effect, increases the

luminous output for a given power input and consequently increases the lamp efficacy. As

Figure 3.3.11 shows, increasing color temperature (a direct effect of, but not equivalent to,

raising operating temperature) causes an increase in luminous efficacy. One way to increase the

filament temperature is by increasing the wattage of the lamp. As a higher current passes

through and a high voltage drop occurs over the filament, the amount of energy released in the

form of heat increases, thereby raising the temperature. However, this significantly changes the

luminous output of the lamp and may not meet the consumer’s needs. Other technologies that

address a lamp’s ability to operate at high temperatures are filament thickness, inclusion of inert

gas fills, and the use of halogen fills, all discussed below.

Figure 3.3.10 Radiating Characteristics of Tungsten

Source: IESNA Lighting Handbook: Reference & Application 20

3­27Figure 3.3.11 Luminous Efficacy versus Color Temperature

Source: IESNA Lighting Handbook: Reference & Application 21

In addition to efficacy, the change in operating temperature also affects lifetime and the

color appearance of the lamp. At the melting temperature of tungsten, 6,120°F, the maximum

efficacy of an incandescent lamp with an uncoiled tungsten filament is 53 lm/W. However, to

obtain long life in an incandescent lamp, the filament should be significantly below its melting

point. As the filament burns hotter, more tungsten evaporates from the filament. When the

filament eventually breaks, the lamp fails. This is an example of the clear tradeoff between lamp

efficacy and lamp lifetime. Also, to maintain the cool bulb surface, high temperature

incandescent lamps often require larger bulbs. This affects the fixtures in which they fit.

3.3.2.2 Microcavity Fi laments

Texturing of t he filament surface can increase surface area and therefore emissivity.

Filament surface perforations also can act as waveguides for visible light. One technology

includes the creation of microcavity holes in the filament surface. The cavities may then be

filled with materials such as tantalum, rhenium, molubdenum, tungsten, SiC, rare­earth elements,

glass beads, or any combination thereof. Depending on their fabrication, this technology can

result in a variety of effects such as greater control of emissive direction, reduction of infrared

radiation, and increased emission efficiency over a certain bandwidth of wavelengths.

Ultimately, these effects produce a higher overall efficacy.

Sandia National L aboratories researchers examined microcavity resonance in a tungsten

photonic lattice. DOE has found multiple patents referencing this technology. However,

research indicates that materials patterned at the submicron level may experience problems with

stability. 22

3­283.3.2.3 Novel Filament M aterials

In choosing a filament, some advantageous properties are high melting point, low vapor

pressure, high strength, high ductility, and good radiating characteristics. While tungsten is

primarily used for incandescent lamps, manufacturers also incorporate other metals such as

rhenium to improve ductility. However, these lamps are most commonly used for applications

requiring vibration­resistant lamps. Novel filament materials such as nitrides and carbides have

the potential to improve lamp efficacy by emitting more light in the visible spectrum at a given

temperature than traditional tungsten filaments. However, these novel filaments can also be

brittle, an attribute that can shorten the lamp lifetime.

3.3.2.4 Thinner Filaments

A thinner filament h as an increased resistance and therefore an increased operating

temperature. As previously discussed, a higher operating temperature results in a higher lamp

efficacy. However, as an adverse effect, an incandescent lamp with a thinner filament cannot

withstand as much tungsten evaporation before failing, resulting in a shorter lifetime.

3.3.2.5 Efficient Filament C oiling

Coiling of t he incandescent lamp filament can increase luminous efficacy. The light

output of an incandescent lamp is directly proportional to the light­emitting surface area of the

light source. By coiling the filament, a longer filament can be used, increasing luminous output

and therefore lamp efficacy. Coiling of the tungsten also affects the heat loss from the filament.

The more the filament is coiled, the less the effective area for convective cooling, thereby

increasing filament temperature and lamp efficacy. IRL covered in this rulemaking generally

contain filaments of the type C (coiled) or CC (coiled coil). The highly efficacious CC type

filament, which is more commonly used, consists of the coil wound into another helical coil.

3.3.2.6 Crystallite Fi lament Coatings

A variety of f ilament coatings may be used to increase the efficacy of incandescent

lamps. Layers of micron or submicron crystallites, comprised of thorium, tantalum, and/or

niobium, are deposited on the filament surface. The crystallites are coated with a protective layer

of at least one oxide of thorium, hafnium, scandium, yttrium, cerium, or zirconium. This coating

increases the emissivity of the filament in the visible part of the spectrum without increasing the

infrared radiation. However, as the operating temperature of the filament increases, the

emissivity improvement due to the crystallites decreases.

3.3.2.7 Efficient Filament O rientation

Tungsten filament i n incandescent lamps can be positioned horizontally or vertically with

respect to the base of the bulb. Because the light emitted from the filament is distributed in all

directions, one way to improve efficacy is by designing the lamp in a way such that the most

amount light is able to escape the bulb. By positioning the filament in a horizontal orientation,

the base of the lamp absorbs much of the emitted light along the length of the coil. However, by

positioning the filament in vertical alignment, a small portion of the light is emitted towards the

3­29base. Consequently, more light escapes the bulb and is used for illumination. This can increase

the efficacy of an incandescent lamp by approximately 8 percent.

3.3.2.8 Higher Efficiency Inert F ill Gas

IRL covered i n this rulemaking typically are filled an inert fill gas whose primary

purpose is to reduce the evaporation of tungsten, preventing bulb blackening and increasing

lifetime. In addition, this fill gas increases the pressure inside the bulb or halogen capsule.

However, the fill gas also provides a means of convective heat transfer between the heated

filament and cool bulb surface. This cooling of the filament represents a power loss and an

efficacy reduction due to low temperature operation. Krypton’s low thermal conductivity

decreases the convective cooling of the filament, allowing for higher temperature operation and

therefore higher efficacy. In addition, since the krypton molecule is larger than other elements

such as argon, krypton more effectively slows the evaporation of the filament and therefore

extends the life of the lamp. Xenon, having even lower heat conductivity and larger mass than

krypton, can more drastically change efficacy and life but also at a greater cost.

3.3.2.9 Luminescent Ga s

A large portion o f the incandescent spectrum is composed of wavelengths that cannot be

detected by the human eye. By reacting with these wavelengths, luminescent gases can convert

some portion of the “invisible” part of the incandescent spectrum into visible light. This

conversion increases the amount of lumens emitted by the lamp and thus improves its efficacy.

3.3.2.10 Tungsten­Halogen La mps

Tungsten­halogen la mps are a subgroup of incandescent lamps which use a halogen

element such as bromine, chlorine, fluorine, or iodine to help increase lifetime of the lamp. As

discussed earlier, technologies that increase lifetime also indirectly improve efficacy, because

higher temperature operation becomes more feasible while maintaining product utility. In a

tungsten­halogen lamp, a small diameter fused quartz envelope filled with a halogen molecule

surrounds the filament. Above 500 degrees Fahrenheit, when tungsten evaporates from the

filament, the tungsten molecules combine with the halogen into a gaseous compound. This

compound circulates within the envelope until it contacts the filament again. The heat of the

filament breaks the compound, freeing the halogen and re­depositing the tungsten on the

filament. This regenerative process greatly extends the life of incandescent lamps by reducing

the loss of tungsten material. Also, because tungsten is not being deposited on the bulb surface,

bulb darkening over time is greatly reduced. However, to prevent this bulb darkening, the

halogen lamp must be operated with a sufficiently high bulb wall temperature. For this reason,

dimming circuits that employ low­voltage operation may not reap the same benefits from using

tungsten­halogen lamps. One drawback to the halogen technology is that the halogen capsule is

often under high pressure and therefore susceptible to exploding. For this reason, halogen IRL

often employs a thicker protective glass.

3.3.2.11 Higher Pressure T ungsten­Halogen Lamps

Increasing the p ressure of the halogen capsule by increasing the density of halogen

elements can indirectly raise the efficacy of the tungsten­halogen lamp. The increased density of

3­30halogen elements raises the probability that an evaporated tungsten element combines with a

halogen element in a gaseous compound. Adding more of this gaseous compound in the capsule

effectively increases the amount of tungsten re­deposited on the tungsten filament, which can

lengthen the lifetime of the tungsten­halogen lamp or raise its efficacy by allowing for higher

temperature operation of the filament.

3.3.2.12 Non­Tungsten­Halogen Re generative Cycles

The regenerative c ycle of filament evaporation and re­deposition can be used to greatly

increase the life of an incandescent lamp. The filament can burn at a higher temperature than

conventional incandescent lamps while maintaining a useful service life. The tungsten­halogen

regenerative cycle is the most common. However, other regenerative cycles are possible.

Implementation of a non­tungsten­halogen regenerative cycle depends on incorporating a nontungsten filament.

3.3.2.13 Infrared Glass C oatings

Infrared coatings o n incandescent lamps are used to reflect some of the radiant energy

emitted back onto the filament. This infrared radiation then supplies heat to the filament and the

operating temperature increases. As discussed earlier, an increase in operating temperature

results in a higher light output and therefore an increase in efficacy. In addition, the spectrum of

the incandescent lamp shifts toward shorter wavelengths. These infrared coatings can be in

many forms, such as multilayer dichroic filters and crystal lattice structures whose spacing

defines a photonic bandgap. They can be applied to the glass halogen capsule for tungstenhalogen lamps. However, they are most commonly used in the coating of the halogen capsule

since one can achieve the greatest directed reflection back onto the filament for the lowest

infrared coating usage. Because the halogen capsule is most traditionally in a cylindrical shape,

when infrared coatings are applied to a halogen lamp, manufacturers use a cylindrical capsule to

help direct the light.

3.3.2.14 Integrally Ba llasted Low­Voltage Lamps

The filaments of i ncandescent lamps designed to operate at a low voltages are both

shorter in length and thicker in diameter than the filaments of incandescent lamps designed to

operate at a higher line voltage. Increasing the thickness of the filament can improve lamp

efficacy by increasing the filament temperatures. Using an integral ballast allows an increase in

the efficacy of a lamp because it operates at low voltages, though it is used in a socket with main

line voltage (i.e., it converts the operating voltage of the lamp to a lower wattage from line

voltage). The conversion of line voltage to lower lamp operating voltages has associated energy

losses. However, modern integral ballast technologies allow efficacy gains from low­voltage

operation to outweigh any such conversion losses.

3.3.2.15 Higher Efficiency Reflector C oatings

Though aluminum i s most prevalent as a reflector coating in incandescent reflector

lamps, silver coatings can also be applied. While aluminum coatings are applied internally by

condensation of vaporized aluminum on the inner surface of the bulb, silver can be applied both

on the interior and exterior surfaces of the bulb. When applied externally, the silver coating is

3­31protected by a cooper coating and aluminum finish. Silver coatings are generally preferred over

aluminum due to their lower light loss. Gold is also extremely reflective and can be used to

increase the amount of directed light and therefore efficacy of the lamp. An infrared coating that

reflects the infrared radiation back toward the lamp’s filament can also be applied. This infrared

reflector coating, in the form of multilayer dichroic filters or crystal lattice structures, ultimately

increase lamp efficacy by limiting the amount of energy lost through infrared radiation and by

increasing lamp operating temperature.

3.3.2.16 Trihedral Co rner Reflectors

Due to t he shape of many reflector lamps, infrared lens technologies can be incorporated

in the cover glass to direct infrared radiation back onto the filament. Conventional infrared

coatings on reflector lamps direct the infrared light back into the bulb, but not directly onto the

filament. Other parts of the lamp absorb some of this heat, which is therefore a source of energy

loss. Trihedral corner reflector is a technology that incorporates individual corner reflectors into

the cover glass. These reflectors’ shapes provide the unique ability to reflect light directly back

in the direction it came. Therefore any light coming from the filament and impinging on the

cover glass will be directed straight back to the filament. These reflectors are covered with a

dichroic coating, allowing visible light to pass through and escape while causing infrared

radiation to reflect back on the filament. As this radiation heats the filament, the lamp requires

less input power to operate at a higher operating temperature, and therefore operates more

efficaciously.

3.3.2.17 Efficient Filament P lacement

Placement of t he filament is an important aspect of incandescent reflector design. The

placement of the filament is optimal when a portion of the spectrum emitted by the filament is

focused back onto the filament. This additional radiation supplies heat to the filament and the

operating temperature increases. As discussed earlier, an increase in operating temperature

results in a higher light output and therefore an increase in efficacy.

3.4 PRODUCT CL ASSES

When evaluating and e stablishing energy conservation standards, DOE divides covered

products into classes by the type of energy used, capacity, or other performance­related features

that affect efficiency, and factors such as the utility of the product to users. (See 42 U.S.C.

6295(q)) DOE usually establishes different energy conservation standards for different product

classes. DOE applied the criteria of 42U.S.C. 6295(q) to GSFL and IRL to develop product

classes for the ANOPR. This section of the TSD describes the product classes DOE considers

for this rulemaking.

3.4.1 General Service F luorescent Lamps

In setting e nergy conservation standards for fluorescent lamps, EPCA established product

classes based on its definition for fluorescent lamps and on nominal lamp wattages. Table 3.4.1

shows the product classes set by EPCA

⎯ two for each lamp type

⎯ for a total of eight product

classes. (42 U.S.C. 6295(i)(1)(B))

3­32Table 3.4.1 EPCA Product Classes for General Service Fluorescent Lamps

Product Class Lamp Type N ominal Lamp W attage

#1 Four­Foot M e dium Bipin > 35 W

#2 Four­Foot M e dium Bipin ≤ 35 W

#3 Two­Foot U ­Shaped > 35 W

#4 Two­Foot U ­Shaped ≤ 35 W

#5 Eight­Foot S in gle Pin Slimline > 65 W

#6 Eight­Foot S in gle Pin Slimline ≤ 65 W

#7 Eight­Foot R e cessed Double Contact High Output > 100 W

#8 Eight­Foot R e cessed Double Contact High Output ≤ 100 W

The fluorescent lamp market has changed in the 15 years since amendments to EPCA

established these eight product classes. For example, new phosphors are used more frequently in

general illumination applications, changing average CRI values, and new lamps have entered the

market, shifting the market share to different lamp wattages. DOE has revised the product

classes to reflect some of these market changes, and to enable the analysis to better represent the

current market. DOE also reviewed the existing product classes to ensure that any additional

GSFL it regulates fit within the same regulatory framework as existing standards. In its

assessment of GSFL product classes, DOE looked to statutory criteria (42 U.S.C. 6295(q)) and

identified utility and physical attributes of fluorescent lamps around which to set product classes.

In the A NOPR Federal Register notice, DOE considers setting product classes on the

following utility and physical attributes of fluorescent lamps: physical constraints of lamps (i.e.,

lamp shape and lamp length), lumen package (i.e., regular versus HO), and correlated color

i temperature. DOE chose not to set product classes based on lamp wattage, lamp diameter (i.e.,

T8 vs. T12), or color rendering index. In addition, DOE did not consider interoperability of

lamps on the same ballast system as a differentiating factor for product classes. The following

subsections discuss these lamp attributes and how they pertain to product class divisions.

3.4.1.1 Physical Constraints o f Fluorescent Lamps

The physical c onstraints of the lamp relate to its shape and length. Because consumers

must change a lamp fixture to substitute lamps of different geometries for one another, lamp

shape affects utility. For example, a U­shaped lamp could not substitute for a linear­shaped lamp

in the same fixture. Also, a 4­foot lamp may have a different utility than an 8­foot lamp, as these

lamps generally may require different fixtures. In addition, a lamp’s geometry also affects its

efficacy. For example, efficacy tends to increase with length. All else being equal, 8­foot lamps

generally have higher efficacy values than 4­foot lamps. Also, a 2­foot U­shaped lamp, while

In the Framework Document, DOE presented its preliminary thoughts on revising the table of standards established

by EPCA. ((42 U.S.C. 6295(i)(1)(A); see 10 CFR 430.32(n)(1)). DOE considered subdividing the product

categories by introducing lamp tube diameter as a differentiating variable (i.e., “>T8” and “≤T8”). In presenting this

concept, DOE used the same wattage divisions and minimum CRI requirements that EPCA uses for these lamps,

with T8 and T12 lamps in the same product class. Having conducted additional research on the GSFL market and

GSFL technologies, DOE does not believe separating product classes by lamp diameter is necessary.

3­33 ihaving the same overall tube length, is less efficacious than a 4­foot linear lamp, partly because

the electrical arc within the tube has to bend to conform to the lamp shape. Given the impact that

geometry has on both utility and efficacy, DOE maintains the division of product classes by lamp

geometry.

3.4.1.2 Lumen Package

L umen package r efers to the quantity of light that a lamp­and­ballast system provides to a

consumer. To obtain a high lumen package, certain lamps are designed to operate with ballasts

that run the lamps at high currents. For example, 8­foot recessed double contact high output

lamps tend to operate at higher currents than 8­foot single pin slimline lamps. This difference in

operating design increases the quantity of light per unit lamp length.

DOE observed t hat consumers tend to use systems with different lumen packages for

different applications. For example, high­lumen­output systems may be installed in certain highceiling or outdoor applications, where large quantities of light are needed. Alternatively,

standard­lumen­output systems might be installed in lower­ceiling applications such as offices or

hospitals, where, for example, distance between the light source and the illuminated surfaces is

not as large. Notable differences in the application of standard output versus high output lamps

indicate a difference in utility.

In addition to p roducing higher light output, operating lamps at a higher current also

decreases efficacy. For example, the efficacy of an 8­foot recessed double contact high output

lamp is as much as 10 percent lower than that of a comparable 8­foot single pin slimline lamp.

Given the observed utility distinctions and notable efficacy differences between standard and

high output lamps, DOE maintains the product class division for 8­foot linear lamps between

slimline and high output lamps.

3.4.1.3 Correlated Co lor Temperature

As discussed i n section 3.3.1.3, in general terms, the CCT is a measure of the perceived

color of the white light emitted from the lamp. As the spectral emission from the lamp is

modified to change the CCT, the lamp efficacy can vary. Due to their greater blue light content,

higher CCT fluorescent lamps tend to have lower efficacies.

For fluorescent l amps, the differences in CCT of the light emission can be so large that

they affect the efficacy of the lamp. Given the impact on efficacy of CCT and utility, DOE is

establishing product classes by CCT range and setting separate efficacy requirements for GSFL

based on CCT. DOE is considering establishing two groups that divide the span of CCT that are

considered general purpose (between 2,500K to 6,600K). This division of product classes occurs

at 4,500K.

3.4.1.4 Ballast Interoperability

No t all l amps operate on the same ballast. Even if lamps have similar geometries,

different ballasts may be required for their operation. However, DOE treats ballast

interoperability as an economic issue (in the LCC and NIA analyses) rather than a product class

3­34issue. In other words, if a consumer needs to change the ballast to replace a lamp, then the

installed cost of both the lamp and ballast are factored into the net present value equation. For

example, DOE considered a T8 lamp a more efficacious replacement for a T12 baseline lamp.

Considering T8 lamps as substitutes for T12 lamps is consistent with DOE’s understanding of

the market, and with manufacturer marketing literature. It is common practice, for example, to

replace a T12 lamp­and­ballast system with a T8 lamp­and­ballast system. In its economic

analysis, DOE accounts for the need to install a new ballast to operate the T8 lamp by including

the installed cost of a new lamp and ballast for the T8 replacement. Had DOE elected to

differentiate these lamps on ballast interoperability, or indeed, lamp diameter, this direct

comparison may not have been made. DOE believes this approach is appropriate for this

rulemaking because there is no unique functionality or service rendered by, for example, one T8

lamp and an equivalent T12 lamp.

3.4.1.5 Lamp Wattage

Th e current r egulations group standards by wattage. However, DOE believes that

product classes would more appropriately structure standards if they did not divide products by

wattage. The main function of a lamp is to provide lumen output, while other attributes such as

CCT, for example, contribute to utility. Wattage measures the power consumed by a lamp in

providing its service. Therefore, DOE does not construe wattage as a direct measurement of

utility. Following guidance from 6295(q), where utility is a factor for structuring product

classes, DOE does not establish product classes on the basis of wattage.

Furthermore, DO E believes combining wattages within one product class would allow

standards to stay relevant with the market. Dividing product classes by wattage locks the

standards to a static wattage structure. While this structure may reflect current product

availability, the market may evolve over time, shifting to different wattages. This scenario is

illustrated by comparing the current GSFL market to the existing GSFL standard structure.

Before the EPCA standard, the 40W GSFL was the most prevalent GSFL offered. Currently, the

common wattage for 4­foot medium bipin GSFL are 40W and 34W for T12 lamps and 32W for

8­foot T8 lamps, where the T8 lamps are energy­saving versions of the T12 lamps. j The existing

product class divides wattage at 35W.

3.4.1.6 Lamp Diameter

A s discussed i n section 3.3.1.5, lamp diameter is a feature of a lamp which impacts lamp

efficacy. DOE uses lamp diameter as a design option, and does not consider using it as a basis

for developing product classes. k Manufacturer marketing literature and general guidance on

lighting design and installation often promote T8 lamp­and­ballast systems as higher efficacy,

energy­saving substitutes for T12 lamp­and­ballast systems. Such substitute systems have the

same lengths and bases, offer comparable lumen output, and can fit within the same fixtures.

Therefore, DOE recognizes that the diameter of the lamp will affect the efficacy, but the utility

j Additional, reduced­wattage T8 4­foot medium bipin lamps are available, but the 32W version is the most

common.

k In the Framework Document, DOE considered separating GSFL with diameters smaller than or equal to T8 from

lamps with diameters greater than T8. On further consideration, DOE has determined that the lamp diameter does

not provide significant unique utility to end­users.

3­35provided to the end­user is comparable and/or equivalent. The substitution of a T8 lamp for a

T12 lamp requires the substitution of a new ballast as well. DOE accounts for new ballast

purchases in its economic analyses of these substitutions (i.e., the LCC and NPV analyses) by

incorporating ballast costs in the equipment costs of the substitutes.

3.4.1.7 Color Rendering I ndex

In its s tandard for fluorescent lamps, EPCA established both an upper and a lower bound

on the CRI of GSL. l EPCA defines GSFL as having a CRI less than 82, effectively exempting

from coverage GSFL with a CRI equal to or greater than 82. (42 U.S.C. 6291(30)(B)(vii); see 10

CFR 430.2) EPCA also established two minimum CRI requirements for each of the four groups

of fluorescent lamps, one at 69 CRI and one at 45 CRI. Within 4­foot medium bipin lamps, for

example, EPCA requires that lamps nominally rated at greater than 35W have a minimum CRI of

69 and lamps nominally rated at 35W or lower have a minimum CRI of 45. (42 U.S.C.

6295(i)(1)(A); see 10 CFR 430.32(n)(1)) In removing the wattage dividers, DOE is also

effectively removing the primary differentiating factor that was used to establish minimum CRI

requirements. DOE considers several approaches to resolve this issue in section III.2.a of the

ANOPR Federal Register notice.

3.4.1.8 Product Classes a nd Standard Form for GSFL

For all t he reasons discussed above, DOE is considering the GSFL product classes listed

in Table 3.4.2. DOE is setting constant efficacy level standards by product class, consistent with

existing standards. This standard would apply to and be constant over the full spectrum of

wattages and diameters for lamps covered by that lamp type and CCT. Chapter 5 provides detail

on the selection of candidate standard levels.

Table 3.4.2 D OE ANOPR Product Classes for GSFL

Lamp Type For C CT ≤ 4 ,500K,

Minimum Lamp Efficacy

lm/W For CCT > 4 ,500K,

Minimum Lamp Efficacy

lm/W

Four­Foot M e dium Bipin Product Class #1 P roduct Class #5

T wo­Foot U ­Shaped P roduct Class #2 P roduct Class #6

E ight­Foot S in gle Pin Slimline Product Class #3 P roduct Class #7

E ight­Foot R e cessed Double Contact HO Product Class # 4 Product Class #8

3.4.2 Incandescent Re flector Lamps

In setting e nergy conservation standards for IRL, EPCA differentiated IRL by wattage

and established six nominal wattage ranges or “bins,” shown in Table 3.4.3. (42 U.S.C.

6295(i)(1)(B))

EPCA also defines GSFL as having a CRI less than 82, effectively exempting from coverage GSFL with a CRI

equal to or greater than 82. (42 U.S.C. 6291(30)(B)(vii); see 10 CFR 430.2)

3­36 lTable 3.4.3 EPCA Product Classes for Incandescent Reflector Lamps

Product Class Nominal Lamp W attage

#1 40­50

#2 51­66

#3 67­85

#4 86­115

#5 116­155

#6 156­205

3.4.2.1 Wattage

For the s ame reasons discussed for GSFL (see section 3.4.1.5), DOE is revising the

product classes so that they are not structured according to wattage. Instead of a structure that

uses wattage divisions, DOE is considering one that encompasses a single range of wattages.

DOE believes that wattage is not a direct measure of utility. DOE also believes that a structure

that encompasses all wattage could better keep pace with the market should it shift to reduced

wattages over time.

As wattage i ncreases for incandescent lamps, efficacy also generally increases. To use a

single range of wattages while taking into account variation in efficacy by wattage, DOE is

developing a single standard per product class as an equation. This equation sets a minimum

efficacy requirement that varies by wattage. Figure 3.4.1 illustrates this standard form. Chapter

5 provides more detail on selection of CSLs.

3.4.2.2 Modified Spectrum

E ISA 2007 ad opted a new definition for “colored incandescent lamp” m which supersedes

DOE’s definition previously incorporated at 10 CFR 430.2. n This new statutory definition

effectively increases the scope of energy conservation standards coverage of IRL to include any

IRL that has a lens containing five percent or more neodymium oxide or is a plant light lamp. As

both of these types of IRL filter out portions of the emitted spectrum of the lamp, many of these

lamps fall under the definition of “modified spectrum” which was also adopted by the new

energy legislation. The EISA 2007 definition of “modified spectrum” reads as follows:

“The term ‘ modified spectrum’ means, with respect to an incandescent lamp, an

incandescent lamp that—

m EISA 2007’s definition of “colored incandescent lamp” reads as follows: “ The term ‘colored incandescent lamp’

means an incandescent lamp designated and marketed as a colored lamp that has—(i) a color rendering index of less

that 50, as determined according to the test method given in CIE publication 13.3­1995; or (ii) a correlated color

temperature of less than 2,500K or greater that 4,600K, where correlated temperature is computed according to the

Journal of Optical Society of America, Vol. 58, pages 1528­1595 (1986).”

n The definition of “colored incandescent lamp” adopted by the 1997 Lamps Test Procedure Final Rule 62 FR

29221,29228 (May 29, 1997) reads as follows: “ Colored incandescent lamp means an incandescent lamp designated

and marketed as a colored lamp that has a CRI less than 50, as determined according to the method given in CIE

Publication 13.2 (see 10 CFR 430.22); has a correlated color temperature less than 2,500K or greater than 4,600K;

has a lens containing 5 percent or more neodymium oxide; or contains a filter to suppress yellow and green portions

of the spectrum and is specifically designed, designated and marketed as a plant light.”

3­37(i) is not a colored incandescent lamp; and

(ii) when operated a t the rated voltage and wattage of the incandescent lamp—

I. has a color point with (x,y) chromaticity coordinates on the Commission

Internationale de l’Eclairage (C.I.E.) 1931 chromaticity diagram that lies

below the black­body l ocus; and

II. has a c olor point (x,y) chromaticity coordinates on the C.I.E. 1931

chromaticity di agram that lies at least 4 MacAdam steps (as reference in

IESNA LM16) d istant from the color point of a clear lamp with the same

filament and b ulb shape, operated at the same rated voltage and wattage.”

(42 U.S.C. 6 291(30)(W))

Modified­spectrum la mps provide unique utility to consumers because they offer a

different light output from incandescent lamps, much like fluorescent lamps with different CCT

values. The same technologies that modify the spectral emission of a lamp also decrease the

lamp’s efficacy. To modify the spectrum, the coating absorbs a portion of the light emission

from the filament. Neodymium coatings or other coatings on modified­spectrum lamps absorb

some of the visible emission from the incandescent filament (usually red), creating a modified,

reduced spectral emission. Since the neodymium or other coatings absorb some of the lumen

output from the filament, these coatings decrease the efficacy of the lamp.

DOE is c oncerned that, given the newly adopted definition of “colored incandescent

lamp,” if DOE were to subject modified­spectrum IRL to the same standard as standardspectrum IRL, then these IRL with modified­spectrum glass or coatings may not be able to

achieve the mandatory standard. Therefore, DOE is planning to establish separate product

classes for regular IRL (those without modification to the spectral emission) and modifiedspectrum IRL (some portion of the spectral emission is absorbed). However, to ensure that a

suitable standard level is set for these lamps (such that they are neither disadvantaged nor

advantaged compared to standard­spectrum lamps, DOE is then establishing an appropriately

scaled efficacy requirement based on DOE’s analysis of standard­spectrum IRL. This

requirement would be adjusted to account for the portions of the spectrum that are absorbed by

the neodymium or spectrally enhancing coating. DOE discusses how this scaling would be

accomplished in Chapter 5, the Engineering Analysis.

3.4.2.3 Spot Versus F lood Incandescent Reflector Lamps

In the F ramework Document, DOE considered setting product classes for IRL based on

beam spread. In particular, DOE considered separate standards for spot and flood IRL. DOE

reviewed technical reports on the performance of spot and flood reflector lamps. DOE

concluded that while there might be different utility for consumers through the light distribution

patterns of a spot reflector lamp versus a flood reflector lamp, the difference in utility does not

affect the efficacy of the lamp. Thus, DOE will not create separate product classes for spot and

flood reflector lamps.

3.4.2.4 Product Classes a nd Standard Form for IRL

3­38In sum, DOE is considering all wattages of IRL to be part of the same product class,

allowing for the standard to be a function of the lamp wattage. As DOE considers more

efficacious replacement lamps, the rated wattages must decrease to maintain consistent levels of

light output and save energy. In addition, DOE is considering energy conservation standards for

full­spectrum IRL separately from modified­spectrum IRL. Table 3.4.4 summarizes the two

product classes DOE considers for the ANOPR. To facilitate stakeholder comment on the IRL

product classes, DOE has continued the product class numbering from the GSFL.

Table 3.4.4 DOE ANOPR Product Classes for IRL

Lamp Category Standard­Spectrum

Minimum Lamp Efficacy

lm/W Modified­Spectrum

Minimum Lamp Efficacy

lm/W

IRL Product Class #9 Product Class #10

Figure 3.4.1 illustrates the standard form for IRL, the continuous curve, as well as the

existing standard, the step function.. / ,

α

Lamp wattage (watts)Efficacy(lumens/watt)

EPCA CSL1 CSL2 CSL3 Lm W ≥ α*( W^ β)

where and β are constants.

Figure 3.4.1 Illustration of IRL Candidate Standard Level Forms

3­39REFERENCES

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, 9 th Edition

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13 Ibid.

14 Waymouth, John F. Electric Discharge Lamps

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Reference and Applications.” Ninth Edition. 2000. p. G­7.

17 Illuminating Engineering Society of North America. “The IESNA Lighting Handbook:

Reference and Applications.” Ninth Edition. 2000. p. G­8.

18 Shionoya, Shiegeo, ed. and William M. Yen, ed. Phosphor Handbook

. 1998 CRC Press:

Boca Raton, FL.

19 Young, R. Gaines and E. G. F. Arnott. The Effect of Phosphor Coating Weight on the Lumen

Output of Fluorescent Lamps. Journal of the Electrochemical Society

. October 1965. 112(10):

pp. 982­984.

20 Rea, Mark S., ed. The IESNA Lighting Handbook: Reference & Application, 9 th Edition

. 2000. The Illuminating Engineering Society of America: New York, New York.

3­4121 Ibid.

22 Ibid.

3­42