Do the CALiPER tests take into consideration the luminaire junction temperature, ensuring that the tested product will maintain its expected life?
Thermal management is a key issue for solid-state lighting. There is currently no industry standard that defines a case or board temperature measurement point or other clear mechanism for determining junction temperature for an LED when installed in a luminaire. IES LM-80 (for lumen depreciation measurement) currently describes a thermocouple attachment point on LEDs, but it is unlikely that this measurement point would be accessible once an LED is installed in a luminaire. CALiPER tests luminaires non-invasively primarily following IES LM-79 and also includes temperature measurements on “hot spots” on the luminaires. These external temperature measurements cannot be quantitatively correlated to junction temperatures, but they provide some indication regarding the operating temperatures in the luminaire. CALiPER is also conducting lumen depreciation testing of selected luminaires — particularly those whose thermal management may be insufficient or that may be subject to high “in situ”
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