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<p>What should I do if LED light bulbs generate heat? LEDs generate heat, and many people think that LEDs are cold light sources. This just refers to the light-emitting principle of LEDs.</p><p><br></p><p>Causes of <a href="https://www.ea-gl.com/led-light-bulb" rel="noopener noreferrer" target="_blank">LED light bulb</a> heating:</p><p>The reason why the LED light bulb heats up is because the added electric energy is not all converted into light energy, but part of it is converted into heat energy, and the conversion efficiency of electricity to light is about 20-30%. In other words, about 70% of the electrical energy is turned into heat.</p><p><br></p><p>Specifically, the LED junction temperature is caused by two factors:</p><p>The internal quantum efficiency is not high, that is, when electrons and holes are recombined, 100% of photons cannot be generated. It is usually called "current leakage" that reduces the recombination rate of carriers in the PN region. The leakage current multiplied by the voltage is the power of this part, which is converted into heat energy, but this part does not account for the main component, because the internal photon efficiency is now close to 90%.</p><p><br></p><p>The photons generated internally cannot all be emitted to the outside of the chip and finally converted into heat. This part is the main one, because at present, the so-called external quantum efficiency is only about 30%, and most of them are converted into heat.</p><p><br></p><p>As mentioned earlier, although the luminous efficiency of incandescent lamps is very low, only about 151m/W, it converts almost all electric energy into light energy and radiates it out. Because most of the radiant energy is infrared, the light efficiency is very low. , But it avoids the problem of heat dissipation.</p><p><br></p><p>Solutions for heat dissipation of LED light bulbs:</p><p>To solve the heat dissipation of LED light bulbs, we mainly start with two aspects. Before and after packaging, it can be understood as LED chip heat dissipation and LED light bulb heat dissipation. The heat dissipation of LED chips is mainly related to the choice and process of substrate and circuit, so this article will not elaborate. This article mainly introduces the heat dissipation of LED light bulbs, because any LED will be made into a lamp, so the heat generated by the LED chip is always dissipated into the air through the shell of the lamp.</p><p><br></p><p>If the heat dissipation is not good, because the heat capacity of the LED chip is very small, the accumulation of a little heat will make the junction temperature of the chip increase rapidly, and if it works at a high temperature for a long time, its life will be shortened quickly. However, there are many ways for this heat to actually guide the chip to the outside air.</p><p><br></p><p>However, the heat dissipation of the LED lamp housing will have different options depending on the power size and the place of use. There are mainly the following heat dissipation methods:</p><p>Aluminum fins: This is the most common way to dissipate heat. Use aluminum fins as part of the housing to increase the heat dissipation area.</p><p>Thermally conductive plastic shell: Fill the plastic shell with thermally conductive material during injection molding to increase the thermal conductivity and heat dissipation capacity of the plastic shell.</p><p>Aerodynamics uses the shape of the lamp housing to create convective air, which is the lowest cost way to enhance heat dissipation.</p><p>The inside of the fan lamp housing uses a long-life and high-efficiency fan to enhance heat dissipation, which is low in cost and good in effect. However, it is more troublesome to change the fan, and it is not suitable for outdoor use. This design is relatively rare.</p><p>The heat pipe uses heat pipe technology to conduct heat from the LED chip to the heat dissipation fins of the housing. This is a common design in large lamps, such as street lamps.</p><p>Surface radiation heat treatment The surface of the lamp housing is treated with radiation heat. The simple method is to apply radiation heat dissipation paint to take the heat away from the surface of the lamp housing by radiation.</p>
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