Using constant voltage power supply is an important cause of LED light decay - News - Global IC Trade Starts Here 工业

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Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

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Abstract: To supply power to the LED, it must be powered by a constant current power supply. After the current is constant, no matter how the temperature changes, the volt-ampere characteristic shifts to the left and the current does not change! The junction temperature will not viciously cycle!
Now everyone is beginning to realize that light decay is the main reason why high-power LED street lights can't work for a long time. It is also beginning to realize that an important way to reduce light decay is to improve its heat dissipation. Despite this, judging from the test results of various street lamps by the Shenzhen Lighting Environmental Management Center, the light decay of most street lamps is still unable to meet the requirements for use. The light decay after 1200 hours of lighting, the best is 8%, the worst is 26%, the average is 14%. According to Cree's test results, when the junction temperature is 105 degrees, 14% of the light decay should be after 6000 hours of operation, and the junction temperature of most street lamps is above 105 degrees.