Light emitting diode (LED) is a common light-emitting device, which releases energy through electron hole recombination. It is widely used in the field of lighting. LED can efficiently convert electric energy into light energy, and has a wide range of applications in modern society, such as lighting, flat panel display, medical devices and so on. This electronic component appeared as early as 1962. In the early stage, it can only emit low luminosity red light. Later, other monochromatic versions have been developed. The light that can be emitted has spread all over visible light, infrared and ultraviolet light, and the luminosity has also been improved to a considerable luminosity. The purpose is also used as indicator light and display board at the beginning. With the continuous progress of technology, LED has been widely used in display and lighting.

LED lamp features

LED lamps are light-emitting diodes, which use solid semiconductor chips as light-emitting materials. Compared with traditional lamps, LED lamps are energy-saving, environment-friendly, color rendering and response speed.

（1） Energy saving is the most prominent feature of LED lamps

In terms of energy consumption, the energy consumption of LED lamps is one tenth of that of incandescent lamps and one quarter of that of energy-saving lamps. This is one of the biggest features of LED lamps. Now people advocate energy conservation and environmental protection. It is precisely because of the characteristics of energy conservation that led lamps are widely used, making LED lamps very popular.

（2） It can work in the high-speed switch state

When we walk on the road, we will find that the screen or picture composed of each LED is unpredictable. This shows that the LED lamp can be switched at high speed. However, for the incandescent lamps we usually use, we can't reach such a working state. In daily life, if you switch too many times, it will directly cause the filament of incandescent lamp to break. This is also an important reason for the popularity of LED lights.

（3） Environmental protection

The interior of the LED lamp does not contain any heavy metal materials such as mercury, but the fluorescent lamp contains mercury, which reflects the environmental protection characteristics of the LED lamp. Now people attach great importance to environmental protection, so more people will be willing to choose environmentally friendly LED lights.

（4） Fast response

Another prominent feature of LED lamp is that the reaction speed is relatively fast. As soon as the power is turned on, the LED light will come on. Compared with the energy-saving lamps we usually use, their reaction speed is faster. When turning on the traditional bulb, it often takes a long time to illuminate the room. It can light up only after the bulb is completely heated.

（5） Compared with other light sources, LED lights are more "clean"

The so-called "clean" does not mean that the surface and interior of the lamp are clean, but that the lamp belongs to a cold light source, will not produce too much heat, and will not attract those insects who like light and heat. Especially in summer, there are many insects in the countryside.

Some insects like heat by nature. Incandescent lamps and energy-saving lamps will generate heat after being used for a period of time. This heat is just what insects like, so it is easy to attract insects. This will undoubtedly bring a lot of pollutants to the surface of the lamp, and the excreta of insects will make the room very dirty. However, the LED light is a cold light source and will not attract insects. In this way, insect excreta will not be produced. Therefore, LED lights are more "clean".