The data detected by the single LED white light on the aging board, the transparent display and the data detected when the LED white light is assembled into a luminaire is definitely a bit of revenue.
The size of this difference depends on the electrical parameters of the LED operation and the design of the luminaire, as well as the environment in which the luminaire is used.
First, what kind of LED white light is selected.
This is very important, the quality of LED white light can be said to be a very important factor. For some examples, the same LED 14mil white light segment chip is used as the representative, and the LED white light enclosed by the general epoxy resin and the white glue and the package glue is lighted in a 30 degree environment. After 1000 hours, the attenuation data is 70% light decay; if packaged with D-type low-resistance glue, in the same aging environment, the light decay is 45%; if the C-type low-resistance glue is packaged, in the same aging environment. If the B-type low-fat glue is encapsulated, in the same aging environment, the light decay of the thousand smaller is -3%; if the low-grade glue of the A type, in the same aging environment, the thousand small dawn Decay to -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 exceeds more than one hundred degrees in a short time, it does not matter, fearing that it will be under the high temperature for a long time, it is a great harm to the LED chip.
Generally speaking, the thermal conductivity of epoxy resin is generally small. Therefore, when the LED chip is lighted, the LED chip emits heat, and the general epoxy resin has limited thermal conductivity, so when you are from the LED white light Externally, the temperature of the LED holder is measured at 45 degrees, and 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 is operated at the temperature of the junction temperature, it is very tormented, which accelerates the aging of the LED white light.
When the LED chip is in operation, the center temperature generates a high temperature of 100 degrees, and the transparent display 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 condition of the LED lamp.
Post time: Oct-17-2019