LM80 sets the standards for uniform test methods for LED manufacturers under controlled conditions for measuring LED lumen maintenance while controlling the LED's case temperature. It also requires the LED manufacturer to measure at a 55 degree celsius, 85 degree celsius as well as one other case temperature chosen by the manufacturer, typically 110 degrees celsius. It also requires the lumen maintenance for at least 6,000 hours of constant DC mode operation. The preferred method is 10,000 hours. LED manufacturers then extrapolate this data to provide lumen maintenance out to L70 or useful lumens life.
At this time IESNA is working on TM21 that will standardize this extrapolation method for all LED manufacturers.
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