The light fades for LED light

LED light failure light in the transmission of the signal weakened, while the LED products made ​​by this stage the global LED manufacturers have different degree of light fades, high-power LED is also bad light, and temperature have a direct relationship, the main reason is determined by the chip, phosphor and packaging technologies. Currently, the market white LED light failure may be one of the most important issue to march to civilian lighting. LED light decline is mainly the following two factors:

First, the LED product quality problems:
1. LED die, the led material is not good, the brightness decreases rapidly.
2. The production process defects, the LED grain cooling can not be a good exported from the Pin, leading to the LED die temperature chip attenuation intensified.

3. Poor production equipment, such as reflow and wave soldering, the temperature of the electric ferrochrome and anti-static effects of LED aging material aging.

Second, the conditions of use:
1.Not using LED constant current driver, part of the LED voltage drivers of LED attenuation over.
2. the drive current is greater than the rated drive conditions.

In fact lead to bad light LED products, the most important thing is hot, although many manufacturers in the secondary products is not particularly pay attention to the problem of heat dissipation, but the long-term use of these sub-LED products, the light fades extent than to have to pay attention to the heat LED products. The thermal resistance of the LED die itself, the influence of silver plastic, the cooling effect of the substrate, as well as colloidal and gold thread and the light fades there.

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