Two factors leading to light decay
At present, the white light led in the market may be one of the first problems to the civil illumination. What causes the LEDs to fade? Generally speaking, there are two major factors in light attenuation for LEDs:
First, the quality of LED products:
1, the use of LED chip poor physique, brightness attenuation faster.
2, the production process has defects, LED chip cooling can not be good from the pin to export, resulting in high temperature led chip to increase the chip attenuation.
II. Conditions of Use:
1, led for constant-current drive, some led by the use of voltage-driven causes of LED attenuation.
2. Driving current is greater than the rated driving condition.
In fact, LED products cause a lot of light failure, the most important thing is the heat, although many manufacturers in secondary products do not pay special attention to the problem of heat, but these secondary led products in the long-term use, the degree of light decay will be higher than the heat-focused LED products. The LED chip itself resistance, the influence of the silver glue, the heat dissipation effect of the substrate, as well as the colloid and the Gold Line are also related to the light decay.