What materials are used to make led lights how to buy？

First, led lights are made of what material

LED, light-emitting diode, is a solid-state semiconductor device, it can directly convert electricity into light. the heart of the LED is a semiconductor wafer, one end of the wafer attached to a bracket, one end is the negative pole, the other end is connected to the positive pole of the power supply, so that the entire chip is epoxy resin encapsulated.

A semiconductor wafer consists of two parts, one is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, which is dominated by electrons on this side. However, when these two semiconductors are connected, a P-N junction is formed between them.

When the current through the wire acting on this wafer, the electrons will be pushed to the P region, in the P region, the electrons and holes compound, and then will be issued in the form of photons of energy, which is the principle of LED light. And the wavelength of light is the color of light, is determined by the formation of the P-N junction material.

Second, how to buy led lights

1, LED brightness (MCD) is different, the price is different. LED for led lamps and lanterns should meet the laser class Ⅰ standard.

2, antistatic ability antistatic ability of LED, long life, and therefore high price. Usually anti-static greater than

700V LEDs can only be used for LED lighting.

3, consistent wavelength LED, consistent color, such as the requirement of consistent color, the price is high. No LED spectrophotometer manufacturers are difficult to produce pure color products.

4, leakage current LED is a one-way conductive luminous body, if there is a reverse current, it is called leakage, leakage current is high LED, short life, low price.

5, the luminous angle use of different LED its luminous angle is not the same. Special light-emitting angle, the price is higher. Such as full diffuse angle, the price is higher.

6, the life of different quality of the key is the life, life by the light decay decision. Light decay is small, long life, long life, high price.

7, chip LED light emitting body for the chip, different chips, the price varies greatly. Japan, the United States of the chip is more expensive, generally Taiwan and domestic chip prices are lower than Japan, the United States (CREE).

8, the size of the chip chip size to the side length, the large chip LED quality than the small chip to good. Price is proportional to the size of the chip.

9, colloid ordinary LED colloid is generally epoxy resin, with anti-UV and fire retardant LED more expensive, high-quality outdoor LED lighting should be anti-UV and fire. Each product will have a different design, different designs for different uses, LED lighting reliability design aspects include: electrical safety, fire safety, applicable environmental safety, mechanical safety, health safety, safe use of time and other factors. From the electrical safety point of view, it should comply with the relevant international and national standards.