Generally speaking, LED should have normal light attenuation, it will become dark after a long time, whether your lamp is light time? Generally, 5% within a year is normal, and 15% within three years, so LED lights may be able to be used after 10 years, but the luminous flux will be reduced a lot. The reason why LED lights suddenly become very dark is usually caused by poor product quality. 1, the LED chip used is not good quality, and the brightness decay is fast. 2, LED for constant current drive, some LED using voltage drive reason LED attenuation over. 3, the driving current is greater than the rated driving conditions. In fact, there are many reasons for LED products light decay, the most critical or heat dissipation problem, although many manufacturers in the secondary products do not pay special attention to the problem of heat dissipation, but these secondary LED products for long-term use, the degree of light decay will be higher than the LED products that pay attention to heat dissipation.
Generally speaking, LED should have normal light attenuation, it will become dark after a long time, whether your lamp is light time? Generally, 5% within a year is normal, and 15% within three years, so LED lights may be able to be used after 10 years, but the luminous flux will be reduced a lot. The reason why LED lights suddenly become very dark is usually caused by poor product quality. 1, the LED chip used is not good quality, and the brightness decay is fast. 2, LED for constant current drive, some LED using voltage drive reason LED attenuation over. 3, the driving current is greater than the rated driving conditions. In fact, there are many reasons for LED products light decay, the most critical or heat dissipation problem, although many manufacturers in the secondary products do not pay special attention to the problem of heat dissipation, but these secondary LED products for long-term use, the degree of light decay will be higher than the LED products that pay attention to heat dissipation.