Why LED high bay light is more and more dark?

It has been found that just buy back when the light is very bright, but use a long time, brightness slowly become low.

The feature of LED is long life, theory life can reach 8 to 100000 hours, of course, some people are skeptical that LED really can achieve such a long life, calculate according to the life of the LED , does LED high bay light can really use to decades not bad?

Currently on the market some products use LED characteristics, declared himself LED high bay light to zero droop, the actual rate of bad light is quite high.With a little attention where has been installed LED high bay light, it is not difficult to find a lot of problems.Just change the LED light source, lighting effect is very obvious, but after a period of validation, the light failure is very serious.Isn't this, specific questions?
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So ,what is light failure ?

Droop refers to the light over a period of using, luminous efficiency is decline, brightness there isn’t high like initially.

The cause of LED high bay light produce failure

Using the LED chip quality is bad, brightness decay rapidly.

The deficiency in the production process, the cooling performance is bad.The LED working temperature is lower, the smaller the droop.

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