The high-power LED lamp bead is a kind of LED lamp bead. Compared with the low-power LED lamp bead, the high-power LED lamp bead has higher power, brighter brightness and higher price. The low-power LED lamp bead rated current is 20mA, and the rated current higher than 20mA can basically be counted as high power. The general power numbers are: 0.25w, 0.5w, 1w, 3w, 5w, 8w, 10w, and so on. The main brightness unit is lm (lumen), and the unit of brightness of low power is generally mcd (millicandela, 1cd=1000mcd), which is the luminous intensity I.
1cd = 1 lm / sr (lumen / stereo arc) = 1 candle. It is interpreted as: the luminous flux emitted by the light source within the solid angle dΩ in the specified direction or the luminous flux dΦ transmitted by the obtained light source, the quotient of which is the luminous intensity I (in candela, cd). The cover can be made of PC tube and has a high temperature resistance of 135 degrees.
High-power LED product classification:
At present, it is widely used in automobile lights, flashlights, lamps and other places as an emerging green, environmentally friendly and energy-saving light source. The reason why LED high power is so called, mainly for low-power LEDs, the current classification standards are summarized in three ways:
The first type is divided into 0.5W, 1W, 3W, 5W, 10W...100W depending on the power, depending on the total power of the molded product after packaging.
The second can be divided into different sizes according to the packaging process: large-size epoxy resin package, mermaid-type epoxy resin package, aluminum substrate (MCPCB) package, TO package, power SMD package, MCPCB integrated package, etc.
The third type can be classified into low light decay high power products and non-low light decay high power products according to the degree of light decay.
Of course, since the parameters of the high-power LED itself are relatively large, there are different classification standards according to different parameters, which are not described here. LED high power is still one of the LED packaging products, which is the most important part of the semiconductor lighting industry.
High-power LED product application notes
In the application process of high-power LED products and devices, heat dissipation, static electricity protection, and soldering have a great influence on their characteristics, which needs to be highly valued by application customers.
First, the heat dissipation of high-power LED products:
Due to the limitations of current semiconductor light-emitting diode chip technology, the photoelectric conversion efficiency of LEDs needs to be improved, especially for high-power LEDs. Because of its high power, about 60% of the electrical energy will become thermal energy release (with the development of semiconductor technology). The photoelectric conversion efficiency will gradually increase), which requires the end customer to do the heat dissipation work when applying high-power LED products to ensure the high-power LED products work normally.
1. Heat sink requirement
Appearance and material: If the sealing requirements of the finished product are not high, it can directly convect with the outside air environment. It is recommended to use aluminum or copper fins with fins.
2. Effective heat dissipation surface area:
For 1W high-power LED white light (other colors are basically the same), we recommend the total heat dissipation surface area of ​​the heat sink to be ≥50-60 square centimeters. For 3W products, it is recommended that the total heat dissipation surface area of ​​the heat sink be ≥150 square centimeters. The higher power depends on the situation and the test results. Try to ensure that the heat sink temperature does not exceed 60 °C.
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