LM-80 the LED Lumen-Maintenance Testing Standard

IESNA published LM-80, the LED lumen-maintenance testing standard in October 2008, The purpose of LM-80 is to establish uniform test methods for lumen maintenance of LED light sources including LED packages, LED lighting modules.In turn, this allows a comparison of test results from various laboratories. LM-80 lists what data needs to be reported,but it does not specify how the data should be presented, nor does it address the uncertainty of testing equipment and repeatability of testing operations. With over a year of experience using the LM-80 standard, more evidence and data are available to analyze its impact. Increasingly, LED users realize and understand that LED lumen-degradation behavior in the first few thousand hours of testing, as specified in LM-80, cannot reliably be used to predict the much longer L70 life. L70 is the time taken for LED light output to fall to 70% of its initial value.In this same timeframe, many LED luminaire products have been qualified for Energy Star certification. The Energy Star criteria for luminaires (SSL v1.1) sets specific lumenmaintenance threshold values that must be achieved after 6000 hours (in contrast with LM-80, which prescribes a test procedure. LM-80-the-LED-Lumen-maintenance-Testing-Standard

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