5A

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### APPENDIX 5A. FOUR-FOOT T5 MINIATURE BIPIN HIGH OUTPUT MODEL

LAMP

TABLE OF CONTENTS

5A.1 INTRODUCTION ................................

.................................................................. 5A- 1

5A.2 METHODOLOGY AND RESULTS ..................................................................... 5A- 1

LIST OF TABLES

Table 5A.2.1 Four-foot T5 MiniBP HO Baseline Lamp ................................ .......................... 5A-2 Table 5A.2.2 Reduced Wattage Four-Foot T5 MiniBP HO Analyzed ..................................... 5A-2 Table 5A.2.3 Performance Characteristics for Modeled Higher Efficacy, Full Wattage

Four-Foot T5 MiniBP HO Lamp ................................ ................................ 5A-35A

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### APPENDIX 5A. FOUR-FOOT T5 MINIATURE BIPIN HIGH OUTPUT MODEL

LAMP

5A.1 INTRODUCTION

As discussed in chapter 5 of this preliminary technical support document (TSD), the U.S.

De partment of Energy ( DOE ) selects higher efficacy lamps as replacements for each baseline lamp identified in the engineering analysis. After identifying more efficacious substitutes, DOE develops candidate standard levels (CSLs). For this rulemaking DOE only considered CSLs at

whic h a full wattage version of the lamp type was available because reduced wattage lamps have limited utility. Manufacturer feedback indicated that reduced wattage lamps have problems starting in cold temperature applications below 60-65 °F and may also exhibit striations in this temperature range. In manufacturer interviews, it was noted that striations remain an issue for reduced wattage lamps because not all ballasts contain striation control circuitry, and those that are equipped with striation control circuitry do not completely eliminate striation. After conducting a review of commercially available products, DOE determined that only reduced wattage versions of 4-foot T5 a 

### miniature bipin (MiniBP) high output ( HO ) lamps are available at efficacies higher than the baseline. Because DOE believes a higher efficacy, full wattage T5 MiniBP HO lamp can be manufactured using commercially available technologies, DOE developed a higher efficacy, full wattage T5 MiniBP HO model lamp f or this product class. The following section describes in greater detail how DOE developed performance characteristics for this product.

5A.2 METHODOLOGY AND RESU LTS

General service fluorescent lamps (GSFLs) with T5 diameters exist in a variety of lengths and wattages. Market research indicates that 4-foot T5 MiniBP HO lamps are offered with a wattage of 54 watts (W) and reduced wattages of 50 W, 49 W, and 47 W. DOE’s market

re search and feedback from manufacturers indicate that the primary drivers of 4-foot T5 MiniBP HO market growth are their use as replacement lamps for 8-foot recessed double contact (RDC) HO and high intensity discharge (HID) lamps in the industrial sector.

As stated in chapter 5 of this TSD, DOE selected a 54 W 4-foot T5 MiniBP HO lamp as a

ba seline because it is representative of the most common, least efficacious lamp in the 4-foot T5

Mi niBP HO representative product class. Table 5A.2.1 li sts the characteristics of the 54 W 4-foot

T5 Mini BP HO baseline lamp.

a Fluorescent lamp diameter is given in eighths of an inch. Thus, a T5 lamp is 5/8 of an inch in diameter.5A

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### Table 5A.2. 1 Four-foot T5 MiniBP HO Baseline Lamp

Lamp

Diameter Nominal

Wattage Rated

Wattage Rated

Efficacy (at 35 °C) Initial

Light Output (at 35 °C) Mean

Light Output (at 35 °C) Rated

Life (PS) CRI CCT

W W lm/W lm lm hr K

T5 54 53.8 92.9 5,000 4,850 24,000 82 4,100



### DOE surveyed the product offerings for the 4-foot T5 MiniBP HO product class and found that no full wattage (54 W) lamps exist with efficacies higher than the baseline. However, DOE noted that several reduced wattage lamps with efficacies higher than the baseline are commercially available. DOE utilized the characteristics of these commercially available reduced wattage T5 MiniBP HO lamps to model an improved full wattage lamp.

After reviewing all reduced wattage products, DOE decided to model a more efficacious

54 W T5 MiniBP HO lamp with an efficacy equivalent to the least efficacious, commercially available reduced wattage lamp. DOE only considered lamps that had all performance specifications available ( i.e. , wattage, initial lumen output at 35 °C, mean lumen output at 35 °C, rated lifetime, color rendering index [CRI], and correlated color temperature [ CCT ]) for this analysis. Of the se lamps, DOE selected the reduced wattage lamp with the lowest efficacy (based on rated initial lumen output at 35 °C) to develop the model lamp. Table 5A.2.2 shows the specifications of the 47 W reduced wattage lamp with an efficacy of 97.3 lumens per watt ( lm/W ), which was the least efficacious commercially available reduced wattage lamp identified.

Table 5A.2. 2 Reduced Wattage Four-Foot T5 MiniBP HO Analyzed

Lamp

Diameter Nominal

Wattage Rated

Wattage Rated

Efficacy (at 35 °C) Initial

Light Output (at 35 °C) Mean

Light Output (at 35 °C) Rated

Life (PS) CRI CCT

W W lm/W lm lm hr K

T5 47 47 97.3 4,575 4,255 30,000 82 4,100



### DOE then calculated the initial lumen output required to achieve a rated efficacy equivalent to that of the selected reduced wattage lamp ( i.e. , 97.3 lm/W) given a rated wattage of

53.8 W (the ANSI rated wattage for a 54 W T5 MiniBP HO lamp). Rated efficacy is calculated as catalog initial lumen output divided by ANSI rated wattage. For lamp types that do not have a defined ANSI rated wattage ( e.g. , the 47 W 4- foot T5 MiniBP HO), DOE utilized the lamp’s nominal wattage to calculate rated efficacy. Next, DOE determined the mean lumen output of the modeled lamp by applying the ratio of mean lumen output to initial lumen output of the reduced wattage lamp at 35 ° C to the initial lumen output of the modeled higher efficacy, full wattage lamp. DOE assumed the same lifetime, CRI, and CCT for the modeled lamp. The resulting specifications of the higher efficacy, full wattage 4-foot T5 MiniBP HO lamp are shown in Table

5A.2. 3

.5A

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### Table 5A.2. 3 Performance Characteristics for Modeled Higher Efficacy, Full Wattage Four-Foot T5 MiniBP HO Lamp

Lamp

Diameter Nominal

Wattage Rated

Wattage Rated

Efficacy (at 35 °C) Initial

Light Output (at 35 °C) Mean

Light Output (at 35 °C) Rated

Life (PS) CRI CCT

W W lm/W lm lm hr K

T5 54 53.8 97.3 5,237 4,871 30,000 82 4,100