As a kind of lighting fixture, car lights can be said to be indispensable when driving at night. In the process of continuous development of LED, more and more car manufacturers have begun to list LED car lights as their first choice for car lights. LED car lights refer to lamps that use LED technology as both external and internal lighting sources inside and outside the car. Exterior lighting equipment involves both thermal limits and EMC, as well as various complex criteria such as unloaded load testing. The utility model can widely use LED car lights to create the interior environment of the car.

The structure of LED car lights:
A single LED is composed of gold wire, LED chip, reflective ring, cathode wire, plastic wire, and anode wire.
The core part of the light-emitting diode is a wafer composed of p-type semiconductor and n-type semiconductor. There is a transition layer between the p-type semiconductor and n-type semiconductor, called a pn junction.
In the PN junction of some semiconductor materials, when a small amount of carriers are injected and most of the carriers recombine, the excess energy will be released in the form of light, so that electrical energy can be directly converted into light energy. When a reverse voltage is applied to the pn junction, a small amount of carriers are difficult to inject, so it does not emit light. This type of diode made using the injection light-emitting principle is called a light-emitting diode, commonly known as LED.

The lighting process of LED consists of three parts:
Carrier injection, recombination radiation, and optical energy transfer under forward bias.
The tiny semiconductor chip is encapsulated in a clean epoxy resin. After the electrons pass through the chip, the negatively charged electrons move to the positively charged hole area and recombine with them. The electrons and holes disappear while photons are generated.
The greater the energy (band gap) between electrons and holes, the greater the energy of the photons generated. The energy of photons corresponds to the color of the light. In the visible light spectrum, blue light and purple light carry the highest energy, while orange light and red light carry the lowest energy. Because different materials have different band gaps, they can emit different colors of light.
When it is in the forward working state (that is, forward voltage is applied to both ends), when the current flows from the LED anode to the cathode, the semiconductor crystal emits light of different colors from ultraviolet to infrared. The intensity of the light is related to the current. For example, an LED is like a hamburger. The light-emitting material is the "meat patty" in the sandwich, and the upper and lower electrodes are the buns sandwiching the meat. Through research on luminescent materials, people have gradually developed LED components with various light colors and increasingly higher luminous efficiency. However, no matter how they change, the overall luminous principle and structure of LEDs have not changed much.

Advantages of LED lights:

1. Energy saving: It directly converts electrical energy into light energy through light-emitting diodes. The power consumption is only half of that of traditional lamps. It can better reduce fuel consumption and protect the car circuit from being burned due to excessive load current.
2. Environmental protection: There are no ultraviolet and infrared rays in the spectrum, low heat generation, no radiation, low glare, and the waste is recyclable, does not contain mercury, has no pollution, and is safe to touch. It is a typical green lighting source.
3. Long life: There are no loose parts in the lamp body, and there are no shortcomings such as filament burning, heat deposition, light attenuation, etc. Under the appropriate current and voltage, the service life can reach 80,000 to 100,000 hours, which is longer than the life of traditional light sources. More than 10 times longer. (With functions such as one-time replacement and lifetime use)
4. High brightness and high temperature resistance. (Electric energy is directly converted into light energy, the heat is small, and it can be touched by hand)
5. Small size: Designers can change the pattern of the lamps at will to diversify the car's shape. The reason why automobile manufacturers favor LEDs is entirely determined by their own advantages.
6. Good stability: LED has strong shock resistance, is encapsulated in resin, is not easily broken, and is easy to store and transport.
7. High luminous purity: the color is bright and bright, no lampshade is needed to filter the light, and the light wave error is less than 10nm.
8. Fast response: no hot start time is required, and it can emit light in just a few μs. Traditional glass bulbs have a delay of 0.3s. When used in tail lights, they can effectively prevent rear-end collisions and ensure driving safety.

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