1. The choice of led lamp bead chip should be better first

The LED lamp bead chip is actually the soul of the LED lamp bead. With the development of technology, the size of the LED lamp bead chip is constantly changing, but in general, the larger the chip, the stronger the voltage and current resistance, but the higher the cost. will be higher. At present, LED lamp beads are generally produced by three camps of chip manufacturers. One is the production of high-quality chip LED lamp beads for Taiwan's technical process, the other is the production of packaged chip LED lamp beads for the United States and Japan, and the third camp is domestic process packaging chips. LED lamp beads.

In terms of the quality and price of LED lamp beads, the products of these three camps are quite different in quality and price. Generally speaking, the LED lamp beads produced by the United States and Japan are of good quality, but the price is relatively high. The quality of lamp bead chips is unstable. Generally speaking, the LED lamp bead chips produced in Taiwan are relatively beautiful and high-quality, and are one of the most cost-effective chips.

In addition, there is another reference factor: some suppliers will use small chips to package LED lamp beads, but the specifications indicate a larger forward current, because generally excellent lighting design engineers often only use about 75% of the forward current of LEDs In order to ensure the life of the lamp bead and reduce the light decay, the brightness of the lamp bead is the same as or even higher than that of other suppliers on the surface, but it is actually at the expense of greatly sacrificing the service life of the LED lamp bead. of. Therefore, to choose a good lamp bead, you must choose a high-quality chip manufacturer.

2. The heat dissipation performance of high-quality LED lamp beads must also be good

Due to the limitation of the current semiconductor LED lamp bead body chip technology, the photoelectric conversion efficiency of LED still needs to be improved, especially the high-power LED lamp bead, because of its high power, about 55% of the electric energy will be released as heat energy (with the With the development of semiconductor technology, the photoelectric conversion efficiency will gradually increase), which requires end customers to do a good job of heat dissipation when applying high-power LED products to ensure the normal operation of high-power LED lamp beads.

1. The heat dissipation of the LED lamp bead heat sink is better:

Appearance and material: If the sealing requirements of LED lamp beads are not high, convection can occur directly with the outside air environment. It is recommended to use aluminum or copper heat sinks with fins.

2. Effective heat dissipation surface area of LED lamp bead heat sink:

For 1W high-power LED lamp beads white light (other colors are basically the same), it is generally recommended that the total effective heat dissipation surface area of the heat sink should be ≥55 square centimeters. For 3W products, it is recommended that the total effective heat dissipation surface area of the heat sink is ≥150 square centimeters. Higher power will increase depending on the situation and test results. Try to ensure that the temperature of the heat sink does not exceed 65 °C, otherwise it will have a great impact on the LED lamp beads.

3. Selection of LED lamp beads cooling bracket:

High-quality LED lamp beads, heat dissipation bracket will be better, because whether it is a plug-in, SMD, high-power or COB led lamp beads, LED lamp beads must face a serious problem is heat dissipation, compared to the electric heat radiation of incandescent bulbs Lighting, the direct electroluminescence of LED lamp beads is a step further, but the energy conversion efficiency of LED lamp beads is still relatively low at present, only about 30% of the input energy is output in the form of light, and the rest is converted into heat. The heat-resistant temperature of the LED lamp bead chip is limited, which is basically about 270 degrees at present. If the heat is not dissipated through the heat conduction channel in time, the junction temperature of the LED lamp bead chip will rise rapidly, resulting in the light decay and shortening of the life of the chip. , and even directly lead to chip damage, and the bracket is an important part of the heat conduction channel of the LED lamp bead. The usual heat dissipation pipe is from the LED lamp bead chip to the heat sink and then to the bracket (some styles use substrates, such as PCB substrates and ceramics Substrate) The commonly used bracket materials are iron, copper, plastic, ceramics, etc. The unit price and cost difference of different materials are relatively large. Usually, ceramics and copper are the best for heat dissipation, followed by thermally conductive plastics and iron, and some have better performance. The thermal conductivity rate of thermally conductive plastic exceeds that of copper, but the cost is higher, and it is generally used less.