Three factors that affecting the quality of LED light

Firstly, what kind of LED chip do you choose?
This point is very important, the quality of the LED chip can be a very important factor. Give me some examples, the same crystal the $ 14mil white light chip for bottom glue with white glue and packaging glue package out of the ordinary epoxy LED lamp beads, single lit environment of 30 degrees, thousand hours later, the attenuation data for 70% of light failure; low bad glue package with a class D, under the same aging environment, thousands of small decline of 45%; If class C low decline glue package, under the same aging conditions. class A low decay glue one thousand small-time decline of 12%; class B low decline glue package in the same environment of aging, thousands of small-time decline of -3%; same aging environment, thousands of small-time decline to -6%.

Why different packaging process will lead to so big the difference?

The main reason is that the LED chip afraid of heat. Occasionally and briefly heated over a hundred degrees, it does not matter, the fear is that at high temperatures for a long time, is a great damage to LED chip.

Generally speaking, ordinary epoxy thermal conductivity is very small, Therefore, when the LED chip work, LED chips emit heat, and the limited ability of ordinary epoxy thermal conductivity, so, when measuring from the LED light source of external45 degrees the temperature of the LED bracket, LED white lights inside the center of the chip temperature may exceed 80 degrees. The LED temperature node is actually 80 degrees, then work in the temperature of the thermostat when the LED chip is very suffering, which speed up the aging of the LED light source.

When the LED chips at work, the central temperature is 100 degrees, it can immediately guide through the stent pin 98% of the heat, thus reducing heat damage to it. So when LED lamp beads bracket temperature is 60 degrees, the center of the chip temperature just 61 degrees.

LED lamp beads can be seen from the above data, choose what kind of packaging process, directly determines the LED lamps light fades

Secondly, LED light source working environment temperature.

According to the data when the aging single LED light source, if there is only one LED light source work, at the same time, it was the ambient temperature is 30 degrees, then the single LED light source work stents temperature will not exceed 45 degrees . This time, the life of this LED is ideal.

If there are 100 LED light source lit simultaneously, and the interval between them is only 11.4mm, then, the stent temperature of the vicinity of the LED light source lamp heap may not exceed 45 degrees, but the lamp heap those LEDs in the middle the light source may reach a high temperature of 65 degrees. This time, it is a test to the LED light source. Those gathered in the middle of the LED light source, in theory, the light fades will be a little faster, and the lights heap surrounding the LED light source, the light fades will be a little slower.

If LED lamp beads apart 25mm or more, then they mutually divergent heat will not be so accumulation, this time, the temperature of each LED lamp beads bracket should be less than 50 degrees, it is more conducive to the normal work of the LED.

If LED working environment is in cold places, the average temperature of the whole year may only be about 15 degrees or less, then the LED life expectancy will longer.

Or when LED working next to a small fan blowing in, disperse heat, it’s also quite helpful to LED life.

Anyway, we should know that the LED is afraid of the heat, the higher the temperature, the shorter the LED life, the lower the temperature the longer LED life. LED ideal working temperature is between negative 5 to zero. This is essentially impossible.

So, we learned that the ideal operating parameters of the LED lamp beads, when doing lighting design, strengthen the function of the thermal conductivity, heat a