What kinds of car headlights are commonly used in the market

There are three types of car headlights commonly used in the market: halogen bulbs, xenon lamps, and LED headlights.

The halogen lamp is the bulb that comes standard in the car. The power is generally 55W, which can be said to be the first generation of automotive headlights; the xenon lamp is the second generation, and the LED headlight is the third generation, which is the latest generation of automotive headlights.

Halogen bulb:

The light-emitting principle of the first-generation automotive headlight halogen bulbs was: after being energized, the tungsten wire was heated to an incandescent state to emit light. Electric energy is converted into thermal energy, and then into light energy; in the process of converting into light energy, about 90% of the heat is converted to infrared light that has no effect on lighting, and only about 10% of the energy is converted into visible light. The efficiency of electro-optical conversion is Only about 10%.

Xenon lights:
The light-emitting principle of the second-generation car headlight xenon lamp is: use a ballast to increase the original car voltage from 12V to 23000V, and high-voltage Xenon generates arc light. As the xenon lamp starts to raise the voltage, and the voltage needs a process, it also determines that the xenon lamp has a delay when it starts, which is to slowly turn on all the time, with a delay of 5-15 seconds.

LED headlights:

The light emitting principle of the third generation headlight LED headlight is: "light emitting diode" emits light.
A light-emitting diode (English: Light-Emitting Diode, LED for short) is a semiconductor electronic component that converts electrical energy into light energy. Light-emitting diodes are produced using the “injection-type electroluminescence principle”, which directly converts electrical energy into light energy, avoiding the conversion of electrical energy into thermal energy and then light energy like halogen lamps, skipping the step of converting into thermal energy, and the efficiency of electro-optical conversion Very high, up to 60%.
Therefore, "bright and energy-saving" is the most significant feature of LED lights. LED lights only need about 60% of the power of the original car's halogen lamp, and the brightness is more than three times that of the original car's halogen lamp. The power of LED lamps is generally 20-30 watts, and the high power of 55W of halogen lamps is not required at all. LED technology is called the third lighting revolution. In the future, our home lamps will also popularize LED.