Why is the power of the LED high when it's just turned on, a

1. LED (including UV) is a cold-start light source. It is a collision between positive and negative electrons to produce photons. But in the process of luminescence, most of them are converted into thermal energy (photoelectric conversion rate light MW / electric power). The thermal energy should be taken away in time, so that the performance of LED can be stable and the working time is long.

 

 

 

2. There is a cold test and a heat test in the LED; the cold test is the test just started, generally changing; the heat test is the test after the lighting period, after the heat stability, the data is stable; - - related to the principle of LED luminescence.

 

 

 

3.0-A is the cold test; B point is the heat test (after a few hours, touch the radiator temperature, without change, is the whole curing system on the heat balance, to test the data is accurate). From the whole life of the LED, there will be such a phenomenon in 1000 hours. According to the national standard of outdoor lighting, it is considered that after 1000 hours, it will be stable and stable.

 

 

 

4. Heat must be exported in time; current/voltage must be constant.