The two main factors of LED light decay
The light decay of LED lighting products is the weakening of the signal of light in transmission. At this stage, the LED products made by global LED manufacturers have different degrees of light decay. High-power LEDs also have light decay, which is directly related to temperature. It is mainly determined by the chip, phosphor and packaging technology. At present, the luminous decay of white LEDs on the market may be one of the primary problems in entering civilian lighting. There are two main factors for the light decay of LED:
1. Quality problems of LED lighting products themselves:
1. The quality of the LED grains used is not good, and the brightness decays quickly.
2. There are defects in the production process, and the heat dissipation of the LED die cannot be well exported from the PIN pin, resulting in excessive LED die temperature and increased chip attenuation.
Second, the use of conditions:
1. The LED is driven by constant current, and some LEDs are driven by voltage to make the LED attenuate.
2. The drive current is greater than the rated drive condition.
In fact, there are many reasons for the light decay of LED lighting products. The most important one is the heat problem. Although many manufacturers do not pay special attention to the problem of heat dissipation in the secondary products, the light decay degree of these secondary LED products will be higher than that if they are used for a long time. The heat dissipation of LED products is higher. The thermal resistance of the LED die itself, the influence of silver glue, the heat dissipation effect of the substrate, and the colloid and gold wires are also related to light decay.
