LED English is (lightemittingdiode), LED lamp bead is the English abbreviation of light-emitting diode, abbreviation LED, which is a popular name.

SMD lamp beads are cheap and can be mass-produced; high-power lamp beads have high brightness, long life, and easy DIY.

SMDLED is the meaning of surface mount light emitting diode. SMD chip helps to improve production efficiency and application in different facilities. It is a solid-state semiconductor device that can directly convert electricity into light. Its voltage is 1.9-3.2V, and the voltage of red light and yellow light is lower. The heart of the LED is a semiconductor chip, one end of the chip is attached to a bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the whole chip encapsulated by epoxy. The semiconductor wafer consists of two parts, one part is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, where electrons are mainly. But when the two semiconductors are connected, a P-N junction is formed between them. When the current acts on the wafer through the wire, the electrons will be pushed to the P region, where the electrons and holes recombine, and then emit energy in the form of photons, which is the principle of LED light emission. The wavelength of light, which is also the color of light, is determined by the material that forms the P-N junction.

Features of LED lamp beads:

1. Applicability: very small, each unit LED chip is 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for variable environments.

2. Stability: 100,000 hours, the light decay is 50% of the initial.

3. Response time: the response time of incandescent lamps is milliseconds, and the response time of LED lamps is nanoseconds.

4. Environmental pollution: no harmful metal mercury.

5. Color: Changing the current can change the color, and the light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification methods to achieve multi-color light emission of red, yellow, green, blue and orange. For example, an LED that is red at low current can turn orange, yellow, and finally green as the current increases.

6. Voltage: LED lamp beads use low-voltage power supply, and the power supply voltage is between 2-4V, which varies according to different products, so it is a better choice than using high-voltage power supply;

7. Current: The working current is 0-15mA, and the brightness varies with the increase of the current

8. Efficiency: consumes 80% less energy than incandescent lamps with the same luminous efficiency.