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Factors affecting LED light decay
In fact, there are many reasons for the light decay of LED products, the key is the problem of heat, although many manufacturers do not pay special attention to heat dissipation in secondary products, but these secondary LED products under long-term use, the degree of light decay will be higher than LED products that pay attention to heat dissipation. The thermal resistance of the LED chip itself, the influence of silver glue, the heat dissipation effect of the substrate, and the colloid and gold wire are also related to light decay.
2020/03/27
First, the quality of LED products themselves:
1. The LED chip used is not in good physique, and the brightness decay is fast.
2. There are defects in the production process, and the heat dissipation of the LED chip cannot be well derived from the PIN pin, resulting in excessive temperature of the LED chip and aggravating the chip attenuation.
II. Conditions of Use:
1. LED is constant current drive, and some LEDs use voltage drive to attenuate the LED.
2. The driving current is greater than the rated driving conditions.
In fact, there are many reasons for the light decay of LED products, the key is the problem of heat, although many manufacturers do not pay special attention to heat dissipation in secondary products, but these secondary LED products under long-term use, the degree of light decay will be higher than LED products that pay attention to heat dissipation. The thermal resistance of the LED chip itself, the influence of silver glue, the heat dissipation effect of the substrate, and the colloid and gold wire are also related to light decay.
Three factors affecting the quality of LED lamps
First of all, what kind of LED white light to choose.
This is very important, and the quality of LED white light can be said to be a very important factor. For example, the same LED white light represented by the wafer 14mil white segment chip, the base glue made of ordinary epoxy resin and the white light glue and the encapsulation glue encapsulated the LED white light, a single lit in a 30-degree environment, after a thousand hours, the attenuation data is 70% of the light decay; If it is packaged with Class D low-aging glue, in the same aging environment, the thousand-hour light decay is 45%; If Class C low-aging glue is packaged, under the same aging environment, the thousand-hour light decay is 12%; If Class B low-decay glue is packaged, in the same aging environment, the thousand-hour light decay is -3%; If Class A low-aging glue, under the same aging environment, the thousand-hour light decay is -6%.
Secondly, the working ambient temperature of the LED lamp beads.
According to the data of the aging of a single LED white light, if only one LED white light works and the ambient temperature it is located is 30 degrees, then the bracket temperature of a single LED white light will not exceed 45 degrees. At this time, the life of this LED will be ideal.
If 100 LED white lights are lit at the same time, and the interval between them is only 11.4mm, then the bracket temperature of the LED white lights around the pile may not exceed 45 degrees, but those LED white lights in the middle of the pile may reach a high temperature of 65 degrees. At this time, it is a test for LED lamp beads. Then, those LED white lights gathered in the middle will theoretically decay faster, while the LED white lights around the pile of lights will decay a little slower.
Anyway, you should know that LED is afraid of heat, the higher the temperature, the shorter the LED life, the lower the temperature, the longer the LED life. The ideal operating temperature for LEDs is, of course, between minus 5 and zero. But this is basically impossible.
Therefore, after we understand the ideal working parameters of LED lamp beads, we try our best to strengthen the function of heat conduction and heat dissipation when designing lamps. Anyway, the lower the temperature, the longer the LED life.
Again, the working electrical parameters of the LED lamp beads are designed. LED side light source LED injection module LED strip light LED waterproof glue filling module Hongyan cab Sany cab Sany Heavy Industry accessories
According to the experimental results, the lower the driving current, the smaller the heat emitted by the LED white light, of course, the smaller the brightness. According to the survey, the design of LED solar lighting circuit, the driving current of LED is generally only 5-10mA; The number of lamp beads used in lamps and lanterns has a large number of products, 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, with the addition of the cover is impervious to air, the air temperature inside reaches 71 degrees of the environment, the low-aging product, the thousand-hour light decay is zero, and the 2000-hour light decay is 3%, which shows that this low-decay LED white light has reached its limit in such an environment, and then it is a kind of damage to it.
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