"Innovation for Tomorrow" is the slogan of the fourteenth session of the Shanghai auto show. Based on this concept, the auto show brings many new technologies to the first facing the public. Mercedes-Benz CLS enjoys its debut on the auto show. Its 71 LED lights design makes it the focus.
LED has been used in automotive lighting for some time, but now there are only two kinds of vehicles applying the all-LED headlights: Mercedes-Benz CLS and Audi A8. According to manufacturers, those Audi A8 sales domestically use Xenon headlights and all LED lights are only options. Then here are the questions: What about all LED headlights? Will them become the future mainstream?
The Development of Car Headlights
Lighting is always an important driving safety issue since the birth of cars. The first Car Headlights were Incandescent Lamps, then from Halogen Lamps to the Xenon Lamps. The latest scientific and technological achievements today show us all-LED-lights.
The earliest Incandescent Lamps required frequent replacement due to the short lifespan of Tungsten. To improve the life of incandescent lights, iodine or bromine had been add to the bulb. That is Halogen bulbs.
Later, scientists found that the noble gas Xenon can issue bright arc light under high-voltage, and high color temperature enables the car headlamps to emit white light just like the sun light. With the 5-year hard work of study by Philips, Xenon Car Headlamps came out. With the current low power consumption and long life, Xenon Car Headlight Kits gradually replace the halogen lamps.
The scientific name for LED is light-emitting diode. It is actually not new. It has been applied in many fields as instruction lights. In the field of automotive lighting, LED was first applied in brake lights due to its quick response. It is a good solution to trail the traffic behind the driver to cut down road accidents. With the development of technology, high brightness LED lamps have been invented. This is also the technical guarantee for LED lights to become car headlights.
Xenon Lamp consists of Starter, Electronic Ballast and xenon sealed in the glass tube. To excite xenon light, the emitting device needs to activate the car's 12V low-voltage high-voltage step-up to 23000V; and the starter will add an instant 23000V high pressure loaded on xenon gas. In the process, leakage can easily produce high voltage ignition and cause a fire.
It is quite different between the emitting principles of LED lamps and xenon lamps. LED is a solid semiconductor component. When powering, only half of these semiconductor materials absorbs energy and the excess energy will be released in the form of light, which converts electrical energy directly into light energy. There is no connection between voltages and the brightness of LED lights. Even a low-voltage of 12V can the car drive the LED Lights to emit. When loaded to the LED voltage is constant, the greater the current through the LED, the brighter the LED lights are.
Lighting Effect Analyzing
Currently, a single LED light source intensity is still less than xenon lamps. Among the majority of the car lights, LED lamp only plays a supporting role for Xenon Headlights. To reach the same brightness, even high-brightness LED requires an additional group LED lights comparing with the xenon lamps. And this group of high-brightness LED costs much and release much more heat than xenon lights.
However, the manufacturers tell us that, through some special power conversion device, LED light can issue different color temperature. The car headlights of Mercedes-Benz CLS can transform the color temperature under certain conditions and can be used as fog lights. Audi A8's daytime running lights can be converted into turn signals.
The Future Prospects of LED Lights
At present, LED lights have been widely used as auxiliary lights for vehicles. In turn lights, fog lights, and many other places LED Lights have replaced other sources. However, the high cost of LED brightness and thermal are the problems that R & D personnel facing. LED lighting as the main front Car Headlights is still immature. If this bottleneck breaks, LED will be the future of the automotive field.
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Reference:
http://auto.enorth.com.cn/system/2011/04/25/006429731.shtml
