LED (Light Emitting Diode) is a rapid rise in recent years, it is a low field-based semiconductor light-emitting electroluminescent device that converts electrical energy to a semiconductor to visible light, it broke through the tungsten filament incandescent lamps and energy-saving light emitting three basic Toner principle, while used electric field to light. LED spectrum is almost all concentrated in the visible light spectrum, the luminous efficiency of up to 80% -90%. Because of long life time, high luminous efficiency, low energy consumption, no radiation, no pollution, LED lighting has been widely used.

    Today, high-power LED has been widely used in automotive as main brake lights, tail lights, turn signal lights, indication lights, can also be used for instrument and interior lighting. In the automotive lighting field, estimated that by 2010, LED tail lights lighting will occupy most of the cars (including reverse lights and license plate lights). The design of all-LED lights (rear lights, brake lights and turn signals) have appeared in the 2000 Cadillac and high-Benz S-class car, additionally, LED also provides an independent interior accent lighting, for example, dome lights, reading lights, grab handles, locks, switches, cup holders, seat belt buckle, mirror frame, etc., used more and more widely.

    Compared with the traditional vehicle lights (such as the incandescent lamp) and others, LED with energy-saving, long life time, maintenance-free, explosion-proof, easy to control and environmental protection advantages, coupled with its unique luminescent properties of LED, making the shape of the lamp will not be deformation because of the long-term being heated, thereby enhancing the entire lamp life time. LED inherently with small size advantage, when it is applied to the front headlight lamps can reduce the volume of the whole assembly, and further make a valuable engine room space and other related equipments. Existing halogen bulbs are mostly designed by the discharge lamps, lights' total length is about 300mm, and in the design of many concept cars, LED lighting is only 125mm long. The advantages of small size, making the design is more flexible and light, and then for the body shape to create different visual perception, it breaks through the traditional circular design. In addition, due to faster than light bulbs, so it quickly convey the back side vehicle of the braking information to help improve driving safety. Therefore, LED lighting system to the car brought a revolutionary opportunity for development.
  
    Now widely used primarily for color LED blue, red and green, etc., white LED lights for cars has just begun. As technology improved, the brightness has been increased, so white LED headlamp of the car has very good prospects.
  
    LED light source as a new alternative to traditional incandescent light source in the technology has matured. However, LED products from the current market, the high cost of higher brightness LED, automotive LED light source luminance demand requires a larger number will undoubtedly increase the cost of vehicle lighting. Now only a small amount of imported luxury cars has been applied, the application of the domestic car industry is also very small. However, with the development of its LED products, high-brightness LED industry to increase production capacity, LED will be very price decline, its good performance makes the LED light source will become mainstream products in automotive lighting.

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