According to LM-80, how to test aging and life of led?

When we talk the LM-80, LED Aging & Life Test, we also will mentioned others, like the TM-21, L70, L30 and so on. According to LM-80, the test lamp should be working 7000h, this standard recommend 10000h, and will set up 3 temperaturs, 55 degrees, 85 degrees, and the third temperature will set up by the operator. According to this require, there have a device which name is LEDLM-80PL LED Optical Aging Test Instrument, it fully meet LM-80, TM-21 etc, and the test result have high accuracy and stable.