A halogen automobile headlamp light source
Halogen lamps are the most common application in auto car headlights, one of the halogen lamps with 40 years of development history, incandescent light bulbs, halogen headlamps is improved, and add halogen gases is incandescent bulbs, can add halogen gases make halogen bulbs more durable than incandescent bulbs, because the direction of the halogen bulbs is comprehensive, it belongs to the diffused light source, People concentrate the light by using a reflector, so we usually use halogen lamps as the light source. A lamp set that concentrates the light through a reflector is called a reflective halogen lamp. Whenever you see a bulb inside your headlamp with a reflector, that's a reflector halogen lamp. The halogen lamp has such characteristics that the warm yellow light is low in brightness and can only illuminate 30-40 meters, but its low color temperature determines its strong penetration ability (like rainy days and foggy weather is very practical), low cost, small size, simple replacement and other advantages.
Two, xenon automotive headlight source (HID)
Xenon headlamp is a kind of gas discharge lamp, in fact, through the use of rectifier will be 12V voltage instantly raised to 23KV high pressure, the high pressure of more than 20,000 volts will be xenon lamp internal inert gas such as xenon gas breakdown, forming an arc between the two electrodes produced by the light. Because xenon headlamps are light emitted by electric arc, they have no tungsten filaments and have a long service life, up to 10 times as bright as halogen lamps and up to 3 times as bright. Because its brightness is much larger than the halogen lamp, some owners of the original car headlamp for halogen lamp, will be converted into xenon headlamp, the author thinks that if the original car for reflective halogen headlamp due to its structure, without lens, instead of xenon headlamp, reflective cover can not effectively gather the light, the light is scattered, Will lead to the driver can not see the road at the same time will flash to the driver's eyes of the car on the other side, so the xenon headlights without lenses are playing rogue. And lens-type halogen lamp instead of xenon headlamp will come in many more aspects. Xenon headlamp countertrend is due to its light is white with blue, its color is not as strong as the yellow halogen lamp penetration, in rainy days and foggy weather, irradiation capacity is not as good as halogen headlamp.
Three, LED automobile headlight source
LED is the abbreviation of Light Emitting Diode, which is translated into Chinese as light-emitting Diode. It was often used in taillights, turn signals and daytime running lights. Due to its advantages, more and more models now use LED as car headlights, and its optical structure is similar to that of xenon lights. Through reflection bowl and lens can become parallel light, LED light around the LED headlight, obviously, the advantages of energy-saving, its high luminous efficiency, its power consumption is only one over twenty of the traditional halogen lamp, (2) the service life is long, the service life of the LED can achieve 50000 hours than xenon headlamps around 30000 hours almost twice as much, (3) the application degree is high, Because it is electronic components seismic good impact resistance, can be used in a variety of environments, (4) small volume, LED smaller element size can almost meet each lamp factory layout and design, (4) fast response, the LED light is microsecond, small intensity attenuation, the LED brightness attenuation is far less than the halogen lamp, those with low use environmental requirements, LED units can be driven only using low voltage DC, and the load is low, unlike xenon lamps that also require a voltage booster.
Four, laser automobile headlight source
Laser headlight is out in recent years, laser headlight is through a laser diode beam, and then through the lens to control the direction of the beam. Laser headlights have many advantages of LED headlights, and the brightness is higher than LED, and a single laser headlight component is much smaller than LED components, only one percent of the size of LED components, the advantage of laser headlights is high brightness, irradiation distance characteristics. Laser headlights generally still need to be used together with LED headlights, because laser headlights although irradiation distance is long and bright, but the irradiation range is narrow, or need LED headlights to supplement the light.