We all know that despite the LED lighting with energy saving, environmental protection, long life, easy control, maintenance-free and so on, but we often hear consumers tell a lot of LED lamps due to the life of LED drive power directly drag LED lighting to make it and Not "longevity," and also adds to the maintenance / usage costs; or the inefficiency of the drive power source causes LED lighting fixtures to be less energy efficient than expected, or because the output current ripple is not well controlled The luminous quality, making LED lighting green energy saving greatly reduced.
Although compared to the average light-emitting device, the life expectancy is much longer, but it also has a certain life expectancy. Early LED flashlight, lamp, such gifts, the use of time is not long, the problem of life is not prominent. But now LED has been widely used in outdoor and indoor lighting, especially high-power LED street light, its power, high fever, long working hours, life problems are very prominent. Theoretically 100,000 hours of life, but in fact they can not do this, the reason, nothing more than driving, cooling, or their own light-emitting chip, which are directly affect the life of the main factors.
If you do not consider the power and drive failure, LED life is mainly manifested in its light fades, that is, a long time, the brightness becomes darker and darker until finally extinguished. Usually 30% of the time to decay as its life, that is to say if a light bulb is only 70% of the brightness just bought then we usually think it's life time is over. This is of course only the technical standards to determine the end of its life, does not affect its continued use, but if you continue to use it, its brightness to achieve the best results, and in some commercial lighting situations, if there is a change in light The most impact on the overall lighting effect. Therefore, we generally determine the end of the life of LED lamps for the initial brightness of 70%. If decay to this level, we need to consider replacing the bulb.