TFLs are typically low pressure mercury vapour gas discharge lamps that utilize fluorescence to produce light. The BEE Star labelling scheme covers 4 feet TFLs with wattages upto 40W. The scheme covers 6500K colour temperature for halo-phosphates and 6500K, 4000K & 2700K for tri-phosphate category. The Star Rating for TFLs is measured in Lumens per Watt. Higher the Lumens/Watt, higher the rating and vice versa.
The label on TFLs after photographic reduction to 16 mm height is be printed on the sleeve.
| STAR RATING | * | ** | *** | **** | ***** |
| Lumens per Watt at 0100 hrs of use | <61 | >=61 & <67 | >=67 & <86 | >=86 & <92 | >=92 |
| Lumens per Watt at 2000 hrs of use | <52 | >=52 & <57 | >=57 & <77 | >=77 & <83 | >=83 |
| Lumens per Watt at 3500 hrs of use | <49 | >=49 & <54 | >=54 & <73 | >=73 & <78 | >=78 |
