With the development of technology and people's increasing emphasis on energy conservation and environmental protection, the application of LED appliances is becoming more and more widespread, but the heat dissipation of LED products is also receiving more and more attention. Therefore, the design and use of ED high and low beam heat sinks are receiving increasing attention. The performance of LED high and low beam heat sinks will directly affect the lifespan of LED products. There are several common issues regarding the heat dissipation of LED high and low beam heat sinks at present.

1、 Analysis of heat dissipation error of LED high and low beam heat sink

1. The internal quantum efficiency is not high. That is to say, when electrons and holes recombine, not all photons can be generated, commonly known as 'leakage current', to reduce 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 is not the main component because the internal photon efficiency is now close to 90%.

2. It is impossible for all internally generated photons to be emitted outside the chip and converted into heat. This part is very important because currently the so-called external quantum efficiency is only about 30%, with most of it converted into heat.

3. Overreliance on thermal conductive materials. Because any high-tech material can be used for heat dissipation. In fact, using ordinary aluminum for heat dissipation, after multiple tests, the temperature of the heat sink is only 3-5 degrees Celsius higher than the bottom of the radiator. That is to say, if materials with excellent thermal conductivity can be used, the temperature can be reduced by 3-5 degrees Celsius with zero thermal resistance.

2、 Solution to the heat dissipation problem of LED high and low beam heat sinks

1. Method: Aluminum fins

This is a common heat dissipation method for LED high and low beam heat sinks. Aluminum fins, as a part of the shell, increase the heat dissipation area, which is also the reason why most heat sinks choose aluminum heat sinks.

Method: Thermal conductive plastic shell

Using LED insulated heat dissipation plastic instead of aluminum alloy to make heat sinks can greatly improve heat dissipation capacity.

3. Aerohydrodynamics

Utilizing the shape of the lamp casing to generate convective air is a low-cost way to enhance heat dissipation.

4. Liquid spherical bubbles

Using liquid bulb encapsulation technology, high thermal conductivity transparent liquid is filled into the bulb of the lamp body. This is a technology that utilizes thermal conductivity and heat dissipation on the light-emitting surface of LED chips, in addition to the principle of reflection.

5. Instructions for using the lamp holder

In low-power household LED lights, the internal space of the lamp holder is often used to partially or completely place the heating drive circuit. This allows for the use of a lamp head with a larger metal surface, similar to a screw head, to achieve heat dissipation, as the metal electrodes and power lines of the lamp head are closely connected to each other. So it can extract some heat to dissipate heat.

6. Insulation heat dissipation plastic replaces aluminum alloy

Insulated heat dissipation plastic replaces aluminum alloy in the production of heat sinks. This LED high and low beam heat sink can increase its heat dissipation capacity by 4-8 times while maintaining the same heat dissipation capacity of the aluminum alloy. The LED high and low beam heat sink made of this heat dissipation material can greatly improve the overall heat dissipation effect. At present, the main methods for solving heat dissipation problems with LED high and low beam heat sinks are as follows.