What Is a USB LED Light?

The headlight of a car is the headlight of the car. The headlight is a lighting fixture that distinguishes the front vision when driving at night, and is symmetrically installed on both sides of the front end of the vehicle. LED is a kind of electroluminescence device. It uses solid semiconductor chip as light-emitting material, and it emits light directly through the recombination of carriers. LED headlights are lighting fixtures made using LEDs as light sources.

The headlight of a car is the headlight of the car. The headlight is a lighting fixture that distinguishes the front vision when driving at night, and is symmetrically installed on both sides of the front end of the vehicle. LED is a kind of electroluminescence device. It uses solid semiconductor chip as light-emitting material, and it emits light directly through the recombination of carriers. LED headlights are lighting fixtures made using LEDs as light sources.

LED LED headlight LED headlight application background

As early as 10 years ago, LED has embarked on its journey into the automotive field. At present, the application of LEDs in interior lighting and brake lights, emergency lights, daytime running lights, etc. has achieved significant results. LEDs are used inside and outside the vehicle. The proportion of lighting sources has exceeded 80%. With the rapid development of LED lighting technology and the gradual decline of costs, LED headlamps have been approaching the bright prospects of large-scale application in mass production vehicle systems after recent stages of technical verification and concept car demonstration. From the comprehensive use of LED lights in the Audi R8 electronic system, to Mercedes-Benz, BMW, Cadillac, Toyota and other companies have also introduced LED headlamps to replace traditional incandescent and HID lamps in car models. I believe that more auto manufacturers will soon LED headlights are the first choice for automotive lighting. ^[1]

LED The principle of white light LED

There are several different working principles of white LEDs. Figure 1 shows three typical principles. The "blue LED + yellow phosphor" type in Figure 2a is the highest level of white LED development, and it is most likely to be used in the first-generation LED automotive headlamp system. The "ultraviolet LED + red-green-blue" three-color phosphor in Figure 1b has the most potential as a general lighting system because of its high color rendering index, but how to overcome it when it is used as a headlamp system The aging effect of ultraviolet light on plastics. The "red-green-blue three-chip" type in Figure 1c has the ability to change the color of light, but it still cannot be used in headlight systems, because it is difficult to overcome it during use. The change of color may come from the difference in the temperature characteristics of the three types of chips, or the loss degradation rate of different LEDs. ^[2]

Figure 1 White LED principle