The Role Of Headlights

- Aug 19, 2018 -

Automobile headlamps usually have incandescent, halogen, xenon and other types. With the continuous development of automotive technology, incandescent vacuum lamps have been eliminated in the past. Now the headlights of automobiles are mainly halogen lamps, xenon lamps and LED headlights.


Halogen lamp


A halogen lamp is a lamp in which a small amount of inert gas iodine is infiltrated into the bulb. Tungsten atoms evaporated from the filament react with iodine atoms to form tungsten iodide compounds. Once the tungsten iodide compound touches the white-hot filament (the temperature exceeds 1450 C), it decomposes into tungsten and iodine, and the tungsten returns to the filament. It reenters the gas. With such a cycle, the filament hardly burns out and the bulb doesn't blacken, so it's longer and brighter than traditional incandescent headlamps. The headlights are commonly used in cars nowadays.


Xenon lamp


Xenon lamp, in short, is HID. It emits twice as much light as a halogen lamp, consumes only two-thirds of its energy, and has a life span of 10 times as long as a halogen lamp. Xenon lamps greatly increase the safety and comfort of driving, and help to ease the tension and fatigue of people driving at night. Drivers can find danger in the first place, so they can get enough reaction time, which greatly reduces the incidence of night accidents.


LED car lamp


LED is the abbreviation of Light Emitting Diode, commonly known as light emitting diodes, they now often appear as light boxes, signboards and various electrical indicators and backlights, but also often automotive headlights, taillights, high brake lights, daytime traffic lights are an important part. Compared with xenon lamp and halogen lamp, LED has higher luminous efficiency, energy consumption is only 1/20 of halogen lamp, in addition, the cost of LED components has been greatly reduced year by year, and the current cost and price is still in the decline of more than 20% per year.


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