The data detected by the single LED white light on the aging board, and the data detected when the LED white light is assembled into a luminaire, is definitely a bit different.
The size of this difference depends on the electrical parameters of the LED during operation and the design of the luminaire, as well as the environment in which the luminaire is used.
First, choose what kind of LED white light.
This is very important, the quality of LED white light can be said to be a very important factor. To give some examples, the same LED 14mil white light segment chip is used as the representative. The LED white light with the epoxy resin and the white glue and the encapsulation glue is used to illuminate the LED white light in a single environment. After 1000 hours, the attenuation data is 70% light decay; if packaged with Class D low-resistance glue, the light decay is 45% in the same aging environment; if the C-type low-resistance glue is packaged, in the same aging environment , the light decay of 12 hours is 12%; if the B-type low-resistance glue is encapsulated, in the same aging environment, the light decay of thousands of hours is -3%; if the low-grade glue of type A, under the same aging environment, thousands of hours of light The decline is -6%.
Why are different packaging processes leading to big differences?
One of the main reasons is that LED chips are afraid of heat. Occasionally, the heat is more than one hundred degrees in a short period of time. It doesn't matter. I am afraid that if I am exposed to high temperature for a long time, it will be a great damage to the LED chip.
Generally speaking, the thermal conductivity of ordinary epoxy resin is very small. Therefore, when the LED chip is lighted, the LED chip emits heat, while the ordinary epoxy resin has limited thermal conductivity, so when you are from the LED white light When the external temperature of the LED holder is measured at 45 degrees, the center temperature of the chip in the white LED may exceed 80 degrees. The temperature node of the LED is actually 80 degrees. Then, when the LED chip works in the temperature of the junction temperature, it is very tormented, which accelerates the aging of the LED white light.
When the LED chip is working, the center temperature produces a high temperature of 100 degrees, and it can immediately release heat through the bracket pin 98%, thereby reducing the damage of heat. Therefore, when the LED white light bracket temperature is 60 degrees, its chip center temperature may be only 61 degrees.
It can be seen from the above data that the LED white light of the packaging process is selected to directly determine the light decay of the LED lamp.
Second, the LED lamp bead works at ambient temperature.
According to the data of the aging of a single LED white light, if only one LED white light is on, and the ambient temperature is 30 degrees, then the stand temperature of the single LED white light will not work. More than 45 degrees. At this time, the life of this LED will be ideal.
If there are 100 LED white lights that work at the same time, the interval between them is only 11.4mm, then the bracket white temperature of the LED white light around the stack may not exceed 45 degrees, but in the middle of the stack Those LED white lights are likely to reach a high temperature of 65 degrees. At this time, the LED lamp bead is a test. Then, those LED white lights gathered in the middle, in theory, the light decay will be faster, and the LED white light around the lamp pile will slow down.
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