Commonly used LED is divided into in-line LED, TOPLED, piranhas and high-power 4 species.
1) In-line LED:
Electrical connection to take the form of 2-pin in-line, is the traditional, low-end products, because the package thermal resistance, the chip heat is not easy, so the decay of light efficiency, short life. The advantage is the price is cheap, you can make a small light angle.
Electrical connection to take 2, 4 or 6-pin patch, is the most commonly used light source. According to the size of the package shape, divided into 0805,1206,3528,3535,5050,5060 and other specifications, the larger the package shape, the better the thermal performance, the greater the corresponding power, the more light output.
Is a 4-pin DIP package, thermal performance and reliability are better than ordinary 2-pin DIP, can withstand 50 ~ 70mA of operating current, the current commonly used light source.
4) high-power LED:
The LEDs, which are designed and manufactured using large-size chips and enhanced thermal channel technology, are usually classified into 0.5W, 1W, 3W and 5W specifications. A single 1W LED can withstand operating currents of over 300mA and output luminous flux of more than 100 lumens. In commercial lighting commercial, traffic control, photography, night vision and other fields. High-power LED prices are still high, with the process of maturity, it will have the hope to completely replace the traditional lighting source, leading the world into a solid light source era.