Many relatives know that LED is a cold light source. Literally, it is understood that there should be no luminous body. In fact, this is not the case. The cold light source does not mean that there is no temperature. It is only a cold light source relative to most current light sources. The time that the LED works normally will have its own calories, and the amount of heat is directly proportional to the power of the LED itself. That is to say, the larger the power of a single LED, the more calories the working time announces.
2 The importance of thermal design
The LED itself is a semiconductor device, and all semiconductor devices have certain temperature requirements for normal operation, including ambient temperature and operating temperature. The normal ambient temperature for normal semiconductor equipment operation is lower than 80 degrees. When the temperature of the PN junction inside the LED reaches 140 degrees, it will fail. During normal operation, its own temperature will be announced through the pin or dedicated chassis, and then it will be announced in the air around the circuit board or aluminum plate connected to the pins to ensure the normal operation of the LED. In general, the single power is more than 0.2W, and aluminum substrates must be used for heat dissipation. Aluminum and aluminum heat sinks are added for high power. Of course, this is related to the number and density of LEDs in the entire lamp. Too low-power LEDs that are gathered together must also consider the thermal design. This is like every piece of electronic products that you have in your family, such as televisions, monitors, and mainframes. Improper heat dissipation design can directly lead to shortened LED lifetime and accelerated light decay speed.