Example FTL and Ballast Specs for EE Procurement

Satish Kumar, Ph.D.Lawrence Berkeley National Laboratory

Energy Efficient Procurement WorkshopMumbai, India

September 20, 2005

EE Specifications for FTLs in China

Rated Power (W)

Minimum Initial Lumen Efficacy (lm/W)Daylight

(6500, 5000k)

Cool

(4000, 3500k)

Warm

(3000, 2500K)

14~21 75 81 81

22~35 84 88 88

36~65 67 74 77

Lumen maintenance must be no less than 80% after 2000 hours of usage

Energy Efficient FTL Procurement and Usage Tips

• FTLs must be matched with appropriate ballasts to ensure ideal usage efficiency and long lamp life

• Lamp surface should be clean with no air bubbles on glass

• Interior phosphor coating should be fine and without any evident granules and of white color

• An EE lamp with a pre-heat starter circuit can prolong the lamp life

• Recommended color range for lamps is in the range of 4000 ~ 5000K

• Avoid turning FTLs on and off frequently• If the ends of FTL become black, it should be replaced• Lamp breakage should be avoided because the FTL

contains poisonous substance mercury

Cost Saving Example for FTLs

Indicator Ordinary Model

Energy Efficient Model

(Triphosphorous)

Tube and Ballast TypeT12, 40 Watts

(magnetic ballast)

T8, 30 Watts

(electronic ballast)

Rated lumen output 2400 2300

Actual lumen efficacy (lm/W) 52 77

Input Power 46 30

Annual Energy Consumption (kWh) 55.2 36

Annual Energy Cost (Rs.) 248.40 162

Lifetime Energy Cost (Rs.) 1738.8 1134

Lifetime Cost Savings (Rs.) 604.80

The energy costs in the table above are calculated on the assumption that the FTL is used 1200 hours per year. The electricity price is assumed at Rs.4.50/kWh. The lifetime energy cost is the sum of annual energy costs and assumes a lifetime of 7 years for the FTLs

BEE Recommendation to CPWD for FTL Efficiency

Lamp Wattage 6500k 4000k 2700K

T8, 36 Watts > 3100 lumens > 3200 lumens > 3200 lumens

T8, 18 Watts > 1250 lumens > 1300 lumens > 1300 lumens

Lumen maintenance 90% after 2000 hours of usage and 85% after 70% life

BEE Recommendation to CPWD for Ballast Efficiency

• The electronic ballasts must meet the performance standards for the ballast lumen factor, the total circuit power and limits of harmonics current as specified in IS 13021 (Part 2): 1991 (Reaffirmed 2000) and electro magnetic interference limits as specified in IS 6842.

• The ballast factor also called ballast lumen factor (BF) for subject ballast is the ratio of the light output of a lamp tested on subject ballast to the light output of the same lamp tested on” reference” ballast under identical environmental conditions. As per IS 13021 (Part 2): 1991 (Reaffirmed 2000), this BF value should not be less than 90 %. BF values may go up to 105 %.

• Ballast Efficacy Factor (BEF) is a measure of ballast system performance or efficacy. BEF may not be indicated in the manufacturer’s literature and must then be specified or requested.

• Only electronic ballasts meet the recommended efficiency levels.

BEE Recommendation to CPWD for Ballast Efficiency

Ballast Efficacy Factor = ballast factor in percent/ballast input power in

Watts

Lamp Type # of Lamps Recommended BEF

T8, 36 W

1 2.25 or higher

2 1.3 or higher

3 0.8 or higher

4 0.68 or higher

FEMP Ballast Recommendation

ELI Electronic Ballast Recommendation

Frequency > 20 kHz

Power Factor > 0.90

Total Harmonic Distortion 32%

In-rush current 20 A for < 3 ms

Current Crest Factor 1.7

Voltage variation Must operate within specified parameters at a range of nominal voltages up to 15% higher or lower than rated operating voltage without reduction in rated life (as by IEC 60929)

Safety Ballast shall comply with applicable parts of

IEC – 60920, 61547, 60928 and all local requirements.

Warranty Minimum 3-year replacement warranty including a labor allowance for electronic ballasts that fail early due to manufacturer defect. Manufacturer shall apply a label with basic warranty terms and a local telephone number to each ballast, written in at least one applicable local language.