The relationship between LED fluorescent tube light attenuation and temperature
Since the LED lamp beads will release a lot of heat during the working process, the LED junction temperature will rise rapidly, and the higher the LED power, the greater the heating effect. The increase in the temperature of the LED chip will cause the change in the performance of the light-emitting device and the degradation of the electro-optical conversion efficiency. In severe cases, it even fails. This requires the use of LED constant current power supply to supply power to the LED lamps. When designing the lamp beads to use the current, it is necessary to consider that the maximum current cannot be used, such as 60mA current, generally 40-45mA is enough, so pay attention to the LED when using it. Parallel connection of lamp beads. Use aluminum substrate as much as possible to dissipate heat. For some high-power lamps, if possible, use a fan to dissipate heat better, and the radiator will be oxidized and blacked. This effect is also good. During power supply operation, the chip control IC will automatically detect and control the current flowing through the LED lamp beads. There is no need to worry about excessive current flowing through the LED lamp beads at the moment of power-on, and there is no need to worry about short-circuiting the load and burning the power supply. Generally, there is a protection circuit. , Its output current is constant. Regarding the relationship between LED fluorescent light attenuation and temperature, it is worth noting that: According to experimental tests, the luminous flux decreases by 3% every time the temperature of the LED lamp beads rises by 5 degrees Celsius. Therefore, the LED lamp must pay attention to the heat dissipation of the LED light source itself. If possible, try to increase the heat dissipation area of the LED light source itself, and reduce the operating temperature of the LED itself. If conditions permit, at the beginning of the design, it should be considered that it is best to separate the power supply part from the light source part, and blindly pursue it. It is not advisable to ignore the working temperature of the LED lamp beads and the power supply in a small size. The appearance is small and exquisite, but the heat dissipation is not handled properly, the life will be shortened, and the corresponding light decay will increase. In a simple summary, the law is temperature High, the light decay is large, and the temperature is low, the luminous decay is small. This is not worth the gain. Therefore, the heat dissipation design of LED lamps is very important.
