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    3. Little knowledge about the heat dissipation of lamps and lanterns

      2021-08-23 11:46:00 524

      Now everyone is using LED lights, and those who have observed carefully will find that LED lights have one characteristic: there is often a radiator at the back of the lamp body. Regarding the emphasis on heat dissipation, LED lights have only become popular since the beginning. Nowadays, no matter how many watts of LED lights are, you need to pay attention to heat dissipation.

      Why are LEDs afraid of heat?

      LED is essentially a semiconductor device (semiconductor is actually a very fragile device). As long as the temperature is slightly higher, its performance will decrease, its life span will be shortened, and it may even be damaged.

      In the LED chip, there are various heat-conducting media and the bottom radiator, so that the heat emitted by the LED can overflow the inside of the lamp body in time, so that the temperature of the LED itself is at a stable low temperature value.

      Ways of heat dissipation of lamps:

      In physics, there are three basic ways of heat conduction, namely conduction, convection and radiation.

      1. Conduction

      The first is conduction. Conduction means that heat will run from the place where the temperature of the object is high along the heat conductor to the part with a lower temperature.

      The factors that affect it are:

      1. Thermal conductivity of heat sink material

      2. Thermal resistance caused by heat dissipation structure

      3. Shape and size of thermal conductive material

      The above three points will affect the speed and efficiency of heat conduction.

      2. Radiation

      Radiation is a phenomenon in which high-temperature objects directly radiate heat outward. Its efficiency depends on the thermal resistance of the surrounding medium and the characteristics of the heat radiating material itself.

      3. Convection

      Convection is the use of gas or liquid flow to take away the heat generated.

      How to judge the heat dissipation performance

      After analyzing the way the lamp emits heat, when we get a lamp, how do we judge whether its heat dissipation is good or not?

      Of course, the easiest and fastest way is to use professional equipment to measure the temperature, and there is another method-called the half-hour illumination method. Generally speaking, when the junction temperature of the LED (the temperature of the PN junction inside the LED chip is referred to as the junction temperature) increases, the luminous flux will decrease. Then, we only need to indirectly measure the illuminance change of the lamp at the same position, and then we can infer the change of junction temperature (just need an illuminance meter to be OK).


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