APPENDIX 5B. T5 MAGNETIC MINIATURE BIPIN BASELINE BALLASTS

TABLE OF CONTENTS

5B.1 INTRODUCTION .........................................................................................................5B-1

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

LIST OF TABLES

Table 5B.2.1 Common Electronic 2-lamp 4-f oot MiniBP T5 SO and HO Ballasts..................5B-1 Table 5B.2.2 Commercially Available Magnetic and Electronic Ballasts ................................5B-2 Table 5B.2.3 Model Magnetic and Electronic 2-lamp 4-foot MiniBP T5 SO and HO
Ballasts .........................................................................................................5B-3

5B-iAPPENDIX 5B. T5 MAGNETIC MINIATURE BIPIN BASELINE BALLASTS

5B.1 INTRODUCTION

Most T5 ballasts are efficient electronic ballasts. During manufacturer interviews, several manufacturers expressed concern that less-efficacious T5 ballasts may enter the U.S. market if no standard is put into place. One manufact urer in particular stat ed that a magnetic T5 ballast might enter the market in the future if T5 ballasts were not covered by standards. Because DOE believes that consumers will pur chase magnetic 4-foot T5 balla sts without a T5 standard if such ballasts are brought to market, DOE develope d models of 4-foot T5 standard output (SO) and high output (HO) magnetic ballasts as ba selines for the SO and HO T5 product classes, respectively. This appendix details the deve lopment of those models. In particular, DOE developed models of a 2-lamp ma gnetic ballast that operates F28T5 lamps and 2-lamp magnetic ballast that operates F54T5HO lamps.

5B.2 METHODOLOGY AND RESULTS

To determine the BEF of a magnetic T5 ballast, DOE analyzed the percentage difference
in BEF for normal ballast factor systems with a similar input power to the T5 system under investigation. DOE tested a range of 2-lamp F28T5 and F54T5HO ballast s from multiple ballast
manufacturers and found that the least effici ent but most common ballast exhibited the
characteristics shown in the table below. The va st majority of F28T5 and F54T5HO ballasts are programmed start (PS), electronic, have a high power factor (PF) (>0.98), low total harmonic distortion (THD) (<10%), and are universal voltage. Furthermore DOE tested the ballast at 277 volts (V) as the majority of ballasts operate in commercial buildings at 277V.

Table 5B.2.1 Common Electronic 2-lamp 4- foot MiniBP T5 SO and HO Ballasts

For Operation

of Starting Method, Input Voltage, Ballast Type, PF,

THD Ballast

Factor

(BF) Input

Power

(W) Ballast Efficiency BEF

2, F28T5 PS, 277V, Electronic, Universal Voltage, 0.99 PF, <10% THD 1.02 64.9 87.1% 1.441

2, F54T5HO PS, 277V, Electronic, Universal Voltage, >0.98 PF, <10% THD 0.99 124.8 85.4% 0.791

The input power of the 2-lamp F28T5 ballast is similar in range to the input power of the 2-lamp F34T12 and F32T8 electronic ballasts (58W and 60W respectively). The input power of the 2-lamp F54T5HO is in similar range to the input power of the 2-lamp F96T12/ES electronic

5B-1ballast (110W). a Because magnetic ballasts are commercially available to operate these lamps, DOE was able to determine the percentage di fference in input power between magnetic and electronic ballasts. Because magnetic ballasts do not exhibit the same BF as electronic ballasts, DOE adjusted the input power of the magnetic ballast so that DOE could compare the input power directly. The adjusted input power was calculated as follows:

Electronic AdjustedInputPower = BF * InputPower Magnetic Equation 5B.2.1 BF Magnetic AdjustedInputPower = Input Power of Magnetic Ballast adjusted to account for difference in ballast factor (BF)

BF Electronic = BF of electronic ballast

BF Magnetic = BF of magnetic ballast

InputPower Magnetic = Input power of magnetic ballast

Table 5B.2.2 Commercially Available Magnetic and Electronic Ballasts

For Operation

Of Ballast Type BF Input Power Adjusted Input Power

2, F32T8

Lamps Magnetic 0.95 76 70

2, F32T8

Lamps Electronic 0.88 58 58

2, F34T12

Lamps Magnetic 0.88 72 71

2, F34T12

Lamps Electronic 0.87 60 60

2, F96T12/ES Lamps Magnetic 0.88 126 126

2, F96T12/ES Lamps Electronic 0.88 110 110

Using the adjusted input power, DOE calculated th at the average increase in input power while maintaining BF. For the F32T8 and F34T12, the av erage increase in input power was 20%. For the F96T12/ES, the average increase in input pow er was 15%. DOE applied these percentages to the F28T5 and F54T5HO ballasts respectively to determine the input power of the ballast. DOE
assumed this ballast would exhi bit the same BF as its electronic counterpart. The results are displayed in the following table.

a Although DOE tested electronic F96T12/ES and F32T8 elec tronic ballasts, DOE used catalog values because DOE chose not to test magnetic F96T12/ES and F32T8 magnetic ballasts.

5B-2Table 5B.2.3 Model Magnetic and Electronic 2-la mp 4-foot MiniBP T5 SO and HO Ballasts

For Operation

Of Ballast Type BF Input Power

2, F28T5 Magnetic 1.02 77.8
2, F54T5HO Magnetic 0.99 143.5

DOE assumed that these magnetic ballasts would exhibit the similar characteristics as their electronic counterparts (e.g., th ese ballasts would be PS) because DOE believes that these ballasts would be used as replacements and ther efore be in the same product class as their electronic counterparts.

5B-3