IES LM 45 2015 FRENCH

This approved method describes the procedures to be followed and the precautions to be observed in performing uniform and reproducible measurements of the electrical and photometric characteristics of general service incandescent filament lamps under standard conditions. Incandescent filament lamps produce radiant power as a result of electric current passing through a tungsten filament, which is surrounded by an inert atmosphere or vacuum within a glass or quartz envelope. Some lamps contain halogens that are employed to maintain a clean bulb wall. Such lamps may also employ bulb coatings that redirect infrared energy back to the filament for improved efficacy or to filter radiation for color control.