How to predict LED life?

Reality problems: LED lights don't live long

Although LED lighting has the characteristics of energy saving, environmental protection, long life, easy control, and maintenance-free, it is ironic that we often hear that LED lighting fixtures do not “longevity” due to the long life of the LED driver itself. The maintenance/use cost is greatly increased; or the efficiency of the driving power supply is not high, which leads to the fact that the energy efficiency conversion ratio of the LED lighting is not as high as it is supposed to, or the luminous quality is affected because the output current ripple is not well controlled. The green energy-saving advantages of LED lighting are greatly reduced, even affecting market penetration.

How to predict LED life?

All things happen, develop and die. Although the life of LED is relatively long compared to the general light emitting device, it also has a certain life span. The early LED was just a gift like a flashlight or a table lamp. The time it took was not long and the problem of life span was not prominent. But now LED has begun to be widely used in outdoor and indoor lighting, especially high-power LED street lamps, its power, high heat, long working hours, the problem of life is very prominent. In theory, it can be 100,000 hours of life, but in fact it is not known. So where is the problem?

If you do not consider the failure of the power supply and drive, the LED's life is reflected in its light decay, that is, a long time, the brightness will be more and more dark, until the final extinguishment. The time to decay by 30% is usually defined as its lifetime.