What is LED light attenuation? What are the factors affecting the LED light failure of emergency fire lighting? For these two questions, I believe that many people do not understand. Shenyang emergency fire lights can be seen in many places in our life. What is LED light failure?
1、 What is LED light attenuation:
The light attenuation of LED products is the signal attenuation of light in transmission. Nowadays, the light attenuation level of LED products made by manufacturers all over the world is different. High power LEDs also have light attenuation, which is directly related to temperature. The key is determined by chip, phosphor and packaging process. Now, the light attenuation of white LED on the market may be one of the main problems in the march to civil lighting.
2、 Several Factors Influencing LED Light Attenuation
1. LED product quality problems:
2. The LED chip used has poor quality and fast brightness attenuation.
3. The production process is defective, and the heat dissipation of LED chip can not be well exported from the PIN pin, resulting in the high temperature of LED chip and increasing chip loss.
3、 Use standard questions:
LED is driven by constant current, and some LED attenuate by voltage driving.
From the normal use of LED, the key factor endangering LED life is heat dissipation. The sources of heat include the Joule heat generated by the normal resistance of the material when it is energized, the heat generated by the PN junction, the Joule heat generated by the parasitic resistance generated in the process, and the heat generated by the attraction of light. The accumulation of heat makes the temperature rise, and the temperature rise makes the performance of the chip decline, decline, aging, and denaturation.
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