LED luminance degradation tests.doc

The environmental conditions for the life test are based on the requirements of the Chinese National Standard GB/T 24824-2009, with the temperature controlled at 25°C ± 5°C, a maximum relative humidity of 65%, and a pressure range of 86 kPa to 106 kPa. For luminance degradation tests, there are 12, 12, 9 and 8 samples subjected to accelerated current stresses of 1.00A,1.30A,1.69A and 2.20A, respectively. According to the Chinese National Standard GB/T 24826-2009, the time it takes to decay the luminance to 50% of the initial value of LED light is chosen to define its life. More detailed test data results can be found in tables 1a-d below.