.Accredited Standards Committee

C78

Electric Lamps

Secretariat:

National Electrical

Manufacturers Association

2101 L Street, N.W.

Washington, D.C. 20037

(202) 457·1981

RETURN TO:

DUE DATE:

reb~~~ Vicki

NEMA

Schofield ~~~~ - \~ 2101 L Street, NW~~ WaShington,~~ ,~

MARCH 29, l~~

LETTER BALLOT

,\~\~ITED STANDARDS COMMITTEE C78 ON . ELECTRIC LAMPS

Topic: Approval of proposed supplement C78. 2x-19xx, Single-Ended Quad

Tubes - Preheat-Start Fluorescent Lamps with I·nternal Means of

Starting with GX32d Bases

Authorized by:

Distributed by:

T.A. Pickett, Chairman

V.H. Schofield, Secretary

Reference Document(s): C78/3545

Statement: The enclosed proposed supplement to C78.2-19xx standardizes

three single-ended quad tube - preheat-start fluorescent lamps

with GX32d bases. Proposed revised C78.2-19xx has already

been submitted to ANSI for pUblication. As usual, any

supplements with be incorporated into the main standard when

it is next revised.

Question: Do you approve proposed supplement C78.2x-19xx

Yes Yes w/comment No (State Reason) Abstain (State Reason)

NOTE: If you cannot vote in the affirmative and wish to be recorded as not

voting or negative, please so state and explain the reasons for your position

on the reverse side of this ballot or on a separate sheet.

o V E R

EE-RM-90-201 COMMENT OOR20

Accredited Standards Committee 

C78 

Secretariat: 

National Electrical 

Manufacturers Association 

2101 L Street, N.W. 

Washington, D.C. 20037 Electric Lamps (202) 457-1981 

RETURN TO: 

DUE DATE: 

Topic: 

;"~~~~~ Vicki Schofield \®~~~ D 

NEMA . ,\.}) 

2101 L Street, NW~~ Washington, ~~ ,~ 

MARCH 29, l~\}.> 

~ ~ LETTER BALLOT 

. \) \~ITED STANDARDS COMMITTEE C78 ON 

ELECTRIC LAMPS 

Approval of proposed supplement C78. 2x-19xx, Single-Ended Quad 

Tubes - Preheat-Start Fluorescent Lamps with Internal Means of 

Starting with GX32d Bases 

Authorized by: T.A. Pickett, Chairman 

Oistributed by: V.H . Schofield, Secretary 

Reference Document(s): C78/3545 

statement: The enclosed proposed supplement to C78.2-19xx standardizes 

three single-ended quad tube - preheat-start fluorescent lamps 

with GX32d bases. Proposed revised C78.2-19xx has already 

been submitted to ANSI for publication. As usual, any 

supplements with be incorporated into the main standard when 

it is next revised. 

Question: Do you approve proposed supplement C78.2x-19xx 

___ Yes ___ Yes w/comment ___ No (State Reason) ___ Abstain (State Reason) 

NOTE: If you cannot vote in the affirmative and wish to be recorded as not 

voting or negative, please so state and explain the reasons for your position 

on the reverse side of this ballot or on a separate sheet. 

o V E R 
signature:

Print or Type Name:

organization Represented:

Date:

Ene.

ee: S. Hopper, NEMA Engineering

C78-2 Members, for information only

EE-RM-90-201 COMMENT OOR20

signature: 

~rint or Type Name: 

organization Represented: 

Date: 

Ene. 

ee: S. Hopper, NEMA Engineering 

C78-2 Members, for information only 
C78.2x-19xx

Page 1

15 WATT, SINGLE-ENDED, QUAD TUBE

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF STARTING

LAMP DESCRIPTION

Lamp Abbreviation. •

Nominal Wattage. • • . . . . . . • 15W/6T5/Q/GX32/PH

• 15

Nominal Dimensions • OAL WIDTH DEPTH

142 mm 40 mm 40 mm

Bulb . • •

Base Type

See Figure One

GX32d-1

Base Dimensions: Base dimensions will subsequently be

incorporated into standards being developed

by American National Standards Committee on

lamp bases and holders, C81.

Dimensional Characteristics

Maximum

Lamp Dim.

(rom)

Maximum Lamp

Outline Dim.

(mm)

H Base Face to Top of Lamp •....•...

C Width of Lamp •...•••••....••.•••

G Depth of Lamp •..•••••••.•.••••••

117

41 (Note 1)

41 (Note 1)

117

45 (Note 2)

45 (Note 2)

Note 1: Applies to glass length only.

Note 2: Max. lamp outline dimensions, take into consideration

bulb/base misalignment.

G:j

I

I I I I

I I I I

I H I I

l

I

(8B I I

'lop View

FIGURE 1

EE-RM-90-201 COMMENT OOR20

C78.2x-19xX 

Page 1 

15 WATT, SINGLE-ENDED, QUAD TUBE 

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF STARTING 

LAMP DESCRIPTION 

Lamp Abbreviation. 

Nominal wattage. . ••• 

15W/6T5/Q/GX32/PH 

15 

Nominal Dimensions 

Bulb 

Base Type 

Base Dimensions: 

OAL WIDTH 

142 mm 40 mm 

See Figure One 

GX32d-1 

DEPTH 

40 mm 

Base dimensions will subsequently be 

incorporated into standards being developed 

by American National standards committee on 

lamp bases and holders, C8l. 

Dimensional Characteristics 

H Base Face to Top of Lamp .... .... . 

C Width of Lamp .................. . 

G Depth of Lamp .................. . 

Maximum 

Lamp Dim. 

(mm) 

117 

41 (Note 1) 

41 (Note 1) 

Note 1: Applies to glass length only. 

Maximum Lamp 

Outline Dim. 

(mm) 

117 

45 (Note 2) 

45 (Note 2) 

Note 2: Max. lamp outline dimensions, take into consideration 

bulb/ base misalignment. 

t-=, G::1 

, 

I I 

FIGURE 1 
C78.2x-19xx

Page 2

Electrical Characteristics

Electrical Characteristics and Light Output vary with ambient

temperature.

Lamp operating Characteristics

Watts ......•...••••••••••••.••••••

Volts .

Amperes •••••••••••••••••••••••••••

15

53

0.325

The preceding lamp operating characteristics are based on base up

operation in a preheat-start-type circuit in an ambient

temperature of 25·C (77·F) with a 60 Hz sinusoidal power supply

and a reference ballast having the characteristics shown in the

following section:

Reference Ballast Characteristics

Rated Input Voltage . Reference Current...•.•.•....•...•

Impedance .

118

0.325A

290 ohms

The general requirements for reference ballasts are stated in

American National Standard specifications for fluorescent lamp

reference ballast, ANSI C82.3-1983.

Cathode Characteristics

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low resistance

Note: Objective resistance of both cathodes in series 25 OHMS

Lamp Starting Requirements

The following values are intended to provide reliable starting at

the ambient temperatures indicated and at higher temperatures up

to a maximum of 110·F (43·C). At temperatures near the top of

that range, however, initial starting will be secured but not

necessarily immediate restarting.

Voltage Between Lamp Terminals

At 32·F (O·C) and above, min. rms••••••••• 108V

max. pk.•••••••• 400V

The voltage limits shall be met at any primary voltage between

90% and 100% of rated voltage.

EE-RM-90-201 COMMENT OOR20

Electrical Characteristics 

C78.2x-19xx 

Page 2 

Electrical Characteristics and Light output vary with ambient 

temperature. 

Lamp operating Characteristics 

Watts . ...................... ••• ... Vol ts ......•.......••.......•••... 

Amperes ............•.•..........•. 

15 

53 

0.325 

The preceding lamp operating characteristics are based on base up 

operation in a preheat-start-type circuit in an ambient 

temperature of 2S "C (77"F) with a 60 Hz sinusoidal power supply 

and a reference ballast having the characteristics shown in the 

following section: 

Reference Ballast Characteristics 

Rated Input Voltage .............. . Reference Current ................ . Impedance ........................• 

118 

0.325A 

290 ohms 

The general requirements for reference ballasts are stated in 

American National Standard specifications for fluorescent lamp 

reference ballast, ANSI C82.3-1983. 

Cathode Characteristics 

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low resistance 

Note: Objective resistance of both cathodes in series ~ 25 OHMS 

Lamp Starting Requirements 

The following values are intended to provide reliable starting at 

the ambient temperatures indicated and at higher temperatures up 

to a maximum of 110 ' F (43"C). At temperatures near the top of 

that range, however, initial starting will be secured but not 

necessarily immediate restarting. 

Voltage Between Lamp Terminals 

At 32 °F (O "C) and above, . ml.n. rms .••...... 

max. pk ...••.... 

108V 

400V 

The voltage limits shall be met at any primary voltage between 

90% and 100% of rated voltage. 
C78.2x-19xx

Page 3

Preheat Current

Min. at 90% of rated primary voltage .••..•

Max. at 106% of rated primary voltage ...••

Radio Interference Suppression

0.280A

0.650A

In order to assist in suppressing radio interference, starters

shall contain a capacitor within the limits of .0008 to .010

microfarad connected internally in such a manner as to be

effectively in parallel with the lamp.

Ballast Design Note

The values in this standard are based on 60 Hz operating

characteristics. The RFI suppression capacitor may affect

starting or operating parameters in high frequency ballasts.

Application Design Note

The temperature of the lamp base measured at the bottom of the

guide post (Point X in FIG. 1) shall not exceed 85°C (higher

temperature under consideration).

Note 1: This temperature shall be measured:

A. with a lamp that is within 2.5% of the lamp operating

characteristics.

B. With a ballast operating at 106% of rated voltage.

C. In the intended luminaire at the maximum operating

temperature.

Note 2: A higher guide post temperature may be acceptable.

Consult lamp manufacturer.

Note 3: This temperature limit is necessitated by the internal

radio interference suppression

capacitor incorporated into the base.

EE-RM-90-201 COMMENT OOR20

Preheat Current 

Min. at 90% of rated primary voltage . .. .. . 

Max. at 106% of rated primary voltage . ... . 

Radio Interference Suppression 

O.280A 

O.650A 

C78.2x-19xX 

Page 3 

In order to assist in suppressing radio interference, starters 

shall contain a capacitor within the limits of .0008 to .010 

microfarad connected internally in such a manner as to be 

effectively in parallel with the lamp. 

Ballast Design Note 

The values in this standard are based on 60 Hz operating 

characteristics. The RFI suppression capacitor may affect 

starting or operating parameters in high frequency ballasts. 

Application Design Note 

The temperature of the lamp base measured at the bottom of the 

guide post (Point X in FIG. 1) shall not exceed 8S-C (higher 

temperature under consideration). 

Note 1: This temperature shall be measured: 

A. With a lamp that is within 2.S% of the lamp operating 

characteristics. 

B. with a ballast operating at 106% of rated voltage. 

C. In the intended luminaire at the maximum operating 

temperature. 

Note 2: A higher guide post temperature may be acceptable. 

Consult lamp manufacturer. 

Note 3: This temperature limit is necessitated by the internal 

radio interference suppression 

capacitor incorporated into the base. 
C78.2x-19xx

Page 4

20 WATT, SINGLE-ENDED, QUAD TUBE

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF START'ING.

LAMP DESCRIPTION

Lamp Abbreviation ••••••••••.•••••••.•• 20W/6T5/Q/GX32/PH

Nominal Wattage ..•..••••...•..••.••.•• 20

Nominal Dimensions.••••••••....•••.••• OAL WIDTH DEPTH

155 mIn 40 mm 40 nun

Bulb See Figure One

Base Type ..........•••.••.•..........• GX32d-2

Base Dimensions: Base dimensions will SUbsequently be

incorporated into standards being developed

by American National Standards committee on

lamp bases and holders, C81.

Dimensional Characteristics

Maximum

Lamp Dim.

(rom)

Maximum Lamp

Outline Dim.

(mm)

H Base Face to Top of Lamp .

C Width of Lamp .•.•.•.•••.....•..

G Depth of Lamp ....••.••.•.....•.

130

41 (Note 1)

41 (Note 1)

130

45 (Note 2)

45 (Note 2)

Note 1: Applies to glass length only.

Note 2: Max. lamp outline dimensions, take into consideration

bUlb/ba~e misalignment.

I'-=c G:j

I

I I I I

I I I I

I H I I

L

I

ga I I

70p Vi...

l'-x

FIGURE 1

EE-RM-90-201 COMMENT OOR20

C78.2x-l9xx 

Page 4 

20 WATT, SINGLE-ENDED, QUAD TUBE 

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF START'ING. 

LAMP DESCRIPTION 

Lamp Abbreviation ••••• • ••••••••••••••• 20W/ 6T5/ Q/ GX32/ PH 

Nominal wattage ......... . ... . . . ... . ... 20 

Nominal Dimensions ................ . .. . OAL 

155 lIIl1I 

WIDTH DEPTH 

40 mm 40 mm 

Bulb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure One 

Base Type.................... . ........ GX32d-2 

Base Dimensions: Base dimensions will subsequently be 

incorporated into standards being developed 

by American National Standards committee on 

lamp bases and holders, CSl. 

Di men sional Characteristics 

H Base Face to Top of Lamp ..... . . 

C width of Lamp ................. . 

G Depth of Lamp ...... . .......... . 

Maximum 

Lamp Dim. 

(InJn) 

130 

41 (Note 1) 

41 (Note 1) 

Note 1 : Applies to glass length only. 

Maximum Lamp 

Outline Dim. 

(mm) 

130 

45 (Note 2) 

45 (Note 2) 

Note 2: Max. lamp outline dimensions, take into consideration 

bulb ba~e misalignment. 

r= C G::j 

, 

FIGURE 1 
C78.2X-19xx

Page 5

Electrical Characteristics

Electrical characteristics and light output vary with ambient

temperature.

Lamp Operating Characteristics

Watts.............................. 20

Volts.............................. 53

Amperes. . . . • • . . • • • • • • . • • • . • • • • • • • . • 0.450

The preceding lamp operating characteristics are based on base up

operation in a preheat-start-type circuit at an ambient

temperature of 25°C (77°F) with a 60 Hz sinusoidal power supply

and a reference ballast having the characteristics shown in the

following section:

Reference Ballast Characteristics

Rated Input Voltage .•.•.•.........• 118V

Re f erence current.................. O. 45 OA

Impedance. . . . . . . . . . . . . . . . . . . . . . . . . . 2090

The general requirements for reference ballasts are stated in

American National Standard specifications for fluorescent lamp

reference ballast, ANSI C82.3-1983.

Cathode Characteristics

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low resi stance

Note: Objective resistance of both cathodes in series 25 OHMS

max.

Lamp Starting Requirements

The following values are intended to provide reliable starting at

the ambient temperatures indicated and at higher temperatures up

to a maximum of 110°F (50°C). At temperatures near the top of

that range, however, initial s~arting will be secured but not

necessarily immediate restarting.

Voltage Between Lamp Terminals

At 32°F (O°C) and above, min. ~s ••••••••••.•••••.• 108V

max. pk 400V

The voltage limits shall be met at any primary voltage between

90% and 110% of rated voltage.

EE-RM-90-201 COMMENT OOR20

Electrical Characteristics 

C78.2x-l9xx 

Page 5 

Electrical characteristics and light output vary with ambient 

temperature. 

Lamp Operating Characteristics 

watts.............................. 20 

Volts.............................. 53 

Amperes............................ 0.450 

The preceding lamp operating characteristics are based on base up 

operation in a preheat-start-type circuit at an ambient 

temperature of 25'C (77°F) with a 60 Hz sinusoidal power supply 

and a reference ballast having the characteristics shown in the 

following section: 

Reference Ballast Characteristics 

Rated Input Voltage................ 118V 

Re f erence current.................. 0.4 50A 

Impedance .......................... 209n 

The general requirements for reference ballasts ar'e stated in 

American National Standard specifications for fluorescent lamp 

reference ballast, ANSI CB2.3-1983. 

Cathode Characteristics 

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • Low resistance 

Note: Objective resistance of both cathodes in series 25 OHMS 

max. 

Lamp Starting Requirements 

The following values are intended to provide reliable starting at 

the ambient temperatures indicated and at higher temperatures up 

to a maximum of llO'F (50'C). At temperatures near the top of 

that range, however, initial s.tarting will be secured but not 

necessarily immediate restarting. 

Voltage Between Lamp Terminals 

At 32 ' F (O'C) and above, min. rms .................. 10BV 

max. pk ......•............ 400V 

The voltage limits shall be met at any primary voltage between 

90% and 110% of rated voltage. 
C78.2x-19xx

Page 6

PREHEAT CURRENT

Min. at 90% of rated primary voltage .••••••.••••••• 0.405A

Max. at 106% of rated primary voltage .•••••..••...• 0.850A

Radio Interference Suppression

In order to assist in suppressing radio interference, starters

shall contain a capacitor within the limits of .0008 to .010

microfarad connected internally in such a manner as to be

effectively in parallel with the lamp.

Ballast Design Note

The values in this standard are based on 60 Hz operating

characteristics. The RFI suppression capacitor may affect

starting or operating parameters in high frequency ballasts.

Application Design Note

The temperature of the lam base measured at the bottom of the

guide post (Point X in FIG. 1) shall not exceed 85°C (higher

temperature under consideration).

Note:

Note 2:

Note 3:

This temperature shall be measured:

A) with a lamp that is within 2.5% of the lamp

operating characteristics.

B) with a ballast operating at 106% of rated voltage.

C) In the intended luminaire at the maximum operating

temperature.

A higher guide post temperature may be acceptable.

Consult lamp manufacturer.

This temperature limit is necessitated by the internal

radio interference suppression capacitor incorporated

into the base.

EE-RM-90-201 COMMENT OOR20

C78.2x-19xX 

Page 6 

PREHEAT CURRENT 

Min. at 90\ of rated primary voltage ...........•... 0.40SA 

Max. at 106\ of rated primary voltage .............. 0.850A 

Radio Interference Suppression 

In order to assist in suppressing radio interference, starters 

shall contain a capacitor within the limits of .0008 to .010 

microfarad connected internally in such a manner as to be 

effectively in parallel with the lamp. 

Ballast Design Note 

The values in this standard are based on 60 Hz operating 

characteristics. The RFI suppression capacitor may affect 

starting or operating parameters in high frequency ballasts. 

Application Design Note 

The temperature of the lam base measured at the bottom of the 

gu ide post (Point X in FIG. 1) shall not exceed 8S · C (higher 

temperature under consideration). 

Note: 

Note 2: 

Note 3: 

This temperature shall be measured: 

A) With a lamp that is within 2.5% of the lamp 

operating characteristics. 

B) with a ballast operating at 106\ of rated voltage. 

C) In the intended luminaire at the maximum operating 

temperature. 

A higher guide post temperature may be acceptable. 

Consult lamp manufacturer. 

This temperature limit is necessitated by the internal 

radio interference suppression capacitor incorporated 

into the base. 
C78.2x-19xx

Page 7

27 WATT, SINGLE-ENDED, QUAD TUBE

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF STARTING

Lamp Description

Lamp Abbreviation .....•••••••••••.•••• 27W/7T5/Q/GX32/PH

Nominal Wattage ..•••.•.•••••..•••••••. 27

Nominal Dimensions.••.••.••••.•••••••• OAL WIDTH DEPTH

171 rnm 40 rnm 40 rom

Bulb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure One

Base Type GX32d-3

Base Dimensions: Base dimensions will subsequently be

incorporated into standards being developed

by American National Standards Committee on

lamp bases and holders, C8l.

Dimensional Characteristics

Maximum

Lamp Dim.

(rnm)

Maximum Lamp

Outline Dim.

(mm)

H Base Face to Top of Lamp .....•.• 146

C Width of Lamp ........•••.•...•.• 41 (Note 1)

G Depth of Lamp ........••••.....•. 41 (Note 1)

Note 1: Applies to glass length only.

146

45 (Note 2)

45 (Note 2)

Note 2: Max lamp outline dimensions, take into consideration

bulb/base misalignment•

...........-1-.....~~.....G:j

I

I

I

I

I

H I

t---+---fLt---+--l

i

FIGURE 1

EE-RM-90-201 COMMENT OOR20

27 WATT, SINGLE-ENDED, QUAD TUBE 

C7B.2x-19xx 

Page 7 

PREHEAT-START FLUORESCENT LAMP WITH INTERNAL MEANS OF STARTING 

Lamp Description 

Lamp Abbreviation •... .. •••••.• ••..•• •. 27W/7T5/Q/GX32/PH 

Nominal wattage ..................... . . 27 

Nominal Dimensions ....... ...... .... .. . OAL WIDTH QEPTH 

171 rnm 40 rnm 40 rnm 

Bulb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure One 

Base Type....................... . ..... GX32d-3 

Base Dimensions: Base dimensions will subsequently be 

incorporated into standards being developed 

by American National Standards Committee on 

lamp bases and holders, CB1. 

Dimensional Characteristics 

Maximum 

Lamp Dim . (rnm) 

H Base Face to Top of Lamp ... ..... 146 

C Width of Lamp .. ... . .... . .......• 41 (Note 1) 

G Depth of Lamp ..... . ..•.......... 41 (Note 1) 

Note 1: Applies to glass length only. 

Maximum Lamp 

outline Dim. 

(mm) 

146 

45 (Note 2) 

45 (Note 2) 

Note 2: Max lamp outline dimensions, take into consideration 

bulb/ base misalignment. 

r:: C '::::I 

, 

FIGURE 1 
C78.2x-19xx

Page 8

Electrical Characteristics

Electrical Characteristics and Light Output vary with ambient

temperature.

Lamp Operating Characteristics

Watts. . . . . . . . . . . . . . . . . . • • . • • . . . • . . . 27

Volts 54

Amperes............................ 0.625

The preceding lamp operating characteristics are based on base up

operation in a preheat-start-type circuit in an ambient

temperature of 25°C (77°F) with a 60 Hz sinusoidal power supply

and a reference ballast having the characteristics shown in the

following section:

Reference Ballast Characteristics

Rated Input voltage ....•.........•. 118

Reference Current 0.625A

Impedance 1540

The general requirements for reference ballasts are stated in

American National Standard Specifications for fluorescent lamp

ballast, ANSI C82.3-1983.

Cathode Characteristics

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low resistance

Note: Objective resistance of both cathodes in Series 25 OHMS

maximum.

Lamp Starting Requirements

The following values are intended to provide reliable starting at

the ambient temperatures indicated and at higher temperatures up

to a maximum of 110°F (43°C). At temperatures near the top of

that range, however, initial starting will be secured but not

necessarily immediate restarting.

Voltage Between Lamp Terminals

At 32°F (O°C) and above, min. rms.••••••.••..••.• 108V

max. pk 400V

The voltage limits shall be met at any primary voltage between

90% and 110% of rated voltage.

EE-RM-90-201 COMMENT OOR20

Electrical Characteristics 

C78.2X-19xX 

Page 8 

Electrical Characteristics and Light output vary with ambient 

temperature. 

Lamp Operating Characteristics 

Watts. . . . . . . . . . . . . . • . . . . • • . . • . . . . . . 27 

Volts................ .. ...... ... . .. 54 

Amperes. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.625 

The preceding lamp operating characteristics are based on base up 

operation in a preheat-start-type circuit in an ambient 

temperature of 2S ' C (77 "F) with a 60 Hz sinusoidal power supply 

and a reference ballast hav ing the characteristics shown in the 

f ollowing section: 

Reference Ballast Characteristics 

Rated Input Voltage .............. . . Reference Current .. ... ...... ..... . . I mpedance ......................... . 

118 

O.625A 

154n 

The general requirements for reference ballasts are stated in 

American National standard Specifications for fluorescent lamp 

ballast, ANSI C82 . 3-1983. 

Cathode Characteristics 

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low resistance 

Note: Ob jective resistance of both cathodes in Series 2S OHMS 

maximum. 

Lamp starting Requirements 

The f ollowing values are intended to provide reliable starting at 

the amb ient temperatures indicated and at higher temperatures up 

to a maximum of 110'F (43·C). At temperatures near the top of 

that range, however, initial starting will be secured but not 

necessarily immediate restarting. 

Vol tage Between Lamp Terminals 

At 32 ' F (O'C) and above, min. rms . ........ ....... 108V 

max. pk .. .•. .. ....... . .. 400V 

The voltage limits shall be met at any primary voltage between 

90% and 110% of rated voltage. 
C78.2x-19xx

Page 9

Preheat Current

Min. at 90% of rated primary voltage ••.••.•.•••••• 0.540A

Max. at 106% of rated primary voltage •.••••••••••• 1.080A

Radio Interference Suppression

In order to assist in suppressing radio interference, starters

shall contain a capacitor within the limits of .0008 to .010

microfarad connected internally in such a manner as to be

effectively in parallel with the lamp.

Ballast Design Note

The values in this standard are based on 60 Hz operating

characteristics. The RFI suppression capacitor may affect

starting or operating parameters in high frequency ballasts.

Application Design Note

The temperature of the lamp base measured at the bottom of the

guide post (Point X in FIG.1) shall not exceed 85°C (higher

temperature under consideration).

Note 1: This temperature shall be measured:

A) with a lamp that is within 2.5% of the lamp

operating characteristics.

B) With a ballast operating at 106% of rated voltage.

C) In the intended luminaire at the maximum operating

temperature.

Note 2: A higher guide post temperature may be acceptable.

Consult lamp manufacturer.

Note 3: This temperature limit is necessitated by the internal

radio interference suppression capacitor incorporated

into the base.

EE-RM-90-201 COMMENT OOR20

Preheat current 

C78.2x-19xx 

Page 9 

Min. at 90% of rated primary voltage .•.•........•. O.S40A 

Max. at 106% of rated primary voltage ..•....•...•. 1.080A 

Radio Interference Suppression 

In order to assist in suppressing radio interference, starters 

shall contain a capacitor within the limits of .0008 to .010 

microfarad connected internally in such a manner as to be 

effectively in parallel with the lamp. 

Ballast Design Note 

The values in this standard are based on 60 Hz operating 

characteristics. The RFI suppression capacitor may affect 

starting or operating parameters in high frequency ballasts. 

Application Design Note 

The temperature of the lamp base measured at the bottom of the 

guide post (Point X in FIG.I) shall not exceed 8S·C (higher 

temperature under consideration). 

Note 1: This temperature shall be measured: 

A) With a lamp that is within 2.S% of the lamp 

operating characteristics. 

B) With a ballast operating at 106% of rated voltage. 

C) In the intended lumina ire at the maximum operating 

temperature. 

Note 2: A higher guide post temperature may be acceptable. 

Consult lamp manufacturer. 

Note 3: This temperature limi~ is necessitated by the internal 

radio interference suppression capacitor incorporated 

into the base.