The data detected by a single LED light source on the aging board must be somewhat different from the data detected when the LED light source is assembled into an LED panel light for aging. The size of this difference depends on the electrical parameters of the LED panel light and the design of the luminaire, as well as the environment in which the luminaire is used.
First of all, what kind of LED white light to choose.
This is very important, and the quality of the LED light source can be said to be a very important factor. For example, the same LED white light, which is represented by the 14mil white light segment chip of Epistar, is encapsulated with ordinary epoxy resin primer, white light glue and packaging glue. After 1,000 hours, the attenuation data is 70% light decay; if it is packaged with Class D low-fat glue, under the same aging environment, the light decay per 1,000 hours is 45%; if it is packaged with Class C low-fat glue, under the same aging environment , 1000-hour light decay is 12%; if the B-type low-fat glue is encapsulated, in the same aging environment, the 1000-hour light decay is -3%; if the A-type low-fat glue, in the same aging environment, 1,000 hours light The decline is -6%.
Why do different packaging processes make such a big difference?
One of the main reasons is that LED chips are afraid of heat. Occasionally being heated more than 100 degrees in a short period of time, it does not matter, I am afraid that it will be a great damage to the LED chip if it is exposed to high temperature for a long time.
Generally speaking, the thermal conductivity of ordinary epoxy resin is very small. Therefore, when the LED chip is lit and working, the LED chip will emit heat, and the thermal conductivity of ordinary epoxy resin is limited. When the temperature of the LED bracket is measured externally to be 45 degrees, the core temperature of the chip in the LED white light may exceed 80 degrees. The temperature node of the LED is actually 80 degrees, so when the LED chip works 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 working, the central temperature produces a high temperature of 100 degrees, and it can immediately dissipate 98% of the heat through the bracket pins, thereby reducing heat damage to it. Therefore, when the temperature of the LED white light bracket is 60 degrees, the core temperature of its chip may only be 61 degrees.
It can be seen from the above data that the choice of LED white light packaging process directly determines the light decay of LED lamps.
Secondly, the working environment temperature of LED lamp beads.
According to the aging data of a single LED white light, if only one LED white light works and the ambient temperature is 30 degrees, then the bracket temperature of the single LED white light will not work. over 45 degrees. At this time, the life of this LED will be ideal.
If there are 100 LED white lights working at the same time, and the interval between them is only 11.4mm, then the bracket temperature of the LED white lights around the stack may not exceed 45 degrees, but the temperature of the LED white lights in the middle of the stack may not exceed 45 degrees. Those LED white lights have the potential to reach high temperatures of 65 degrees. At this time, the LED lamp bead is a test. Then, those LED white lights gathered in the middle will theoretically have a faster light decay, while the LED white lights around the lamp stack will have a slower light decay.
However, if the LED lamp beads are separated by more than 25mm, the heat they radiate from each other will not accumulate so much. At this time, the temperature of each LED white lamp bracket should be less than 50 degrees, which is more conducive to the normal operation of the LED.
If the LED working environment is in a relatively cold place, the average temperature throughout the year may be only about 15 degrees, or less, then the life of the LED will be longer.
Or, when the LED is working, there is a small fan blowing next to it to help it dissipate the heat, which is also very helpful for the life of the LED.
Anyway, everyone should know that LEDs are afraid of heat. The higher the temperature, the shorter the LED lifespan, and the lower the temperature, the longer the LED lifespan. The ideal operating temperature of LEDs is of course between minus 5 and zero degrees. But this is basically impossible.
Therefore, after we understand the ideal working parameters of LED lamp beads, we should try our best to strengthen the functions of heat conduction and heat dissipation when designing lamps and lanterns. Anyway, the lower the temperature, the longer the LED life.
Again, the working electrical parameters of the LED lamp bead are designed.
According to the experimental results, the lower the driving current of the LED white light, the smaller the heat emitted, of course, the smaller the brightness. According to the survey, in the design of LED solar lighting circuit, the driving current of LED is generally only 5-10mA; for products with a large number of lamp beads, such as more than 500 or more, the driving current is generally only 10-15mA , And the driving current of the general popular LED application lighting is only 15-18mA, and few people design the current to more than 20mA.
The experimental results also show that under the driving current of 14mA, and the cover is not ventilated, and the air temperature inside reaches 71 degrees, the low-fat product has zero light decay for 1,000 hours and 3% for 2,000 hours. , which shows that the use of this low-decay LED white light in such an environment has reached its maximum limit, and no matter how large it is, it is a kind of damage to it.
Because the aging board used for aging has no heat dissipation function, the heat generated when the LED works basically cannot be conducted to the outside. This is proved experimentally. The air temperature inside the aging board has reached a high temperature of 101 degrees, and the surface temperature of the cover on the aging board is only 53 degrees, a difference of dozens of degrees. This shows that the designed plastic cover basically does not have the function of heat conduction and heat dissipation. However, in the design of general lamps and lanterns, the function of heat conduction and heat dissipation is considered. Therefore, to sum up, the design of the working electrical parameters of the LED lamp bead should be based on the actual situation. If the heat conduction and heat dissipation function of the lamp is good, it does not matter if the driving current of the LED white lamp is increased a little, because the LED lamp bead works. The heat can be exported to the outside in an instant, and there is no damage to the LED, which is a better care for the LED. On the contrary, if the heat conduction and heat dissipation function of the lamp is so-so, it is better to design the circuit smaller, so that it puts out less heat.
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