Halogen lamps are developed from incandescent lamps. The incandescent lamp we are already familiar with, the great inventor Edison after thousands of attempts, finally found a material - tungsten wire, through the electricity, they can shine, this is the prototype of the incandescent lamp. However, the incandescent lamp has a fatal flaw. That is, although the tungsten wire is bright, the brightness will be limited by the melting point of the tungsten wire. At high temperatures, the tungsten wire will evaporate and condense on the outer shell, causing the lamp bulb to become black and affecting the lifespan. Obviously this incandescent lamp Lamps can't be used directly in cars, so people fill in incandescent lamps with halogen element gas (inert gas), which can effectively increase the melting point and life of the tungsten wire. Under the same power, the brightness of halogens can reach 1.5 in incandescent lamps. Times, life is also 2 to 3 times.
The halogen lamp is an upgraded incandescent lamp. Its advantages are: 1. Low cost and simple production. 2. The color temperature is low and the penetration is good. 3, open faster. 4, in the rain and fog weather, with the reflector better penetration. The disadvantages are: high temperature, poor durability, low brightness.
Xenon lamp is abbreviated as HID and refers to high pressure gas discharge lamp. Its working principle is to pressurize the 12V voltage to a super high voltage of 23000V, rush through the helium gas filled in the quartz tube to make it glow, and then turn the voltage into about 85V to stably supply the xenon bulb with light continuously.
The advantages of Xenon lights are: 1. Blue-white light and long-range lighting. Significantly improved road marking and signage recognition compared to halogen headlamps. 2. High brightness, three times higher brightness efficiency than halogen headlights. 3. Low energy consumption, halogen lamps consume more than 60W of electricity, helium only 35W. 4. Long life, no filament filament structure, life will be much stronger than the halogen headlamps, a group of xenon lamp life of about 3000 hours. 5. Due to the working principle of the xenon headlights, if a malfunction is encountered during use, the xenon gas will not instantly extinguish, but will gradually become dark and extinguish. This allows drivers in the vehicle to have time to deal with headlight failures.
The disadvantages of xenon lamps are: 1. Condensation is poor, and because it is too bright, it is easy to shake the driver of the opposite vehicle and cause an accident. Therefore, xenon headlamps must be equipped with lenses. 2. The penetrating power is poor, and the penetrating power of xenon headlamps is very weak in heavy fog and snow and ice. 3. There is a delay effect. Because of the working principle of xenon headlights, it takes 2-4 seconds to light it. Therefore, when using a daily car, if you need to use the headlights to "shock" the vehicle in front, then you would like to rely on the xenon headlights. That is completely impossible.
An LED lamp, which is a light emitting diode, is a solid-state semiconductor device capable of converting electrical energy into visible light, which can directly convert electricity into light.
The advantages of LED lights are many: 1. Energy saving and environmental protection: The energy consumption of LED lights is 1/20 of that of halogen lamps. 2. The use cost is low and the service life is long 3. The brightness is high: The brightness is much higher than that of halogen lamps and it is used as a brake light warning Lights are no pressure. (Strong penetration) 4. Low pressure safety 5. Light up momentarily。
Disadvantages of LED lights: 1. Heat dissipation problems, if poor heat dissipation will significantly shorten the life. 2. The initial purchase cost is higher.
From the above point of view, halogen lamps, xenon lamps, and LED lamps have their own advantages and disadvantages, but as a whole, there is no doubt that LED lamps have more advantages. Therefore, LED lamps are also the trend of today's automotive headlights.