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Now auto lamp has a incandescent lamp, halogen lamp and xenon lamp, etc. Besides headlamps, other lamps and lanterns, such as small lights, lights, lighting, etc in the compartments is using incandescent lamp. But also popular in recent years the LED lights, such as brake lights, turn signals, etc. Why rise use leds to replace incandescent lamp?

originally, leds have significant advantages compared with incandescent bulbs. It is a long service life, general can reach tens of thousands or even hundreds of hours. Some people think that if the car of the future use of LED lights, the whole car service life without replacement lamps and lanterns. Two is very energy efficient, than the same brightness of incandescent lamp energy saving at least more than half. Third, light quality, basically no radiation, belong to the 'green light'. Four is the LED structure is simple, the internal framework, all round with transparent epoxy resin sealing, good seismic performance. 5 it is no need to heat start time, light fast response speed, Nanosecond) , and is suitable for fast moving objects. Six is applied voltage in 6 - Between 12 volts, completely can be applied in the car. Seven is the LED take up small volume, the designers are free to transform mode of lamps and lanterns, the automobile modeling diversification. Auto makers favor of LED, completely is the advantages of the LED itself.

the LED is a light-emitting diode (in English 发光二极管) Abbreviations, in the early 1960 s have generated. In the 80 s has been widely used in household appliances products, such as the volume of the sound indicator, switches, etc. In the 90 s, some new type of domestic car also has use of LED, the instrument is mainly used for charging instructions, and later to show the state of the engine speed, such as a combination instrument, hubei xiangfan production odometer next to a row of leds, and when the LED driver to step on the gas discharge lamp from the first light in turn, when the pine throttle LED lamp is in turn from top to bottom out, quite strikingly good-looking. In the 90 s, our country is using the LED as high brake lights and installed in the car, because of the high LED lights, can let trailing behind car drivers know as early as possible in front of the vehicle driving condition, reduce automobile rear-end collision accident.

the LED is a kind of can emit their own light contains solid semiconductor components for the p-n junction. The LED chip is composed of p-type and n-type semiconductor semiconductor chips, between the p-type and n-type semiconductor semiconductor has a transition layer, called the pn junction. When using gallium arsenide ( Infrared) Gallium phosphide (arsenic, Red to yellow) , gallium phosphide ( Green) Such as semiconductor materials, in the semiconductor pn junction, the injection of minority carrier with majority carrier compound will release excess energy in the form of light, so as to directly convert the electric energy to light energy. When the p - N junction put forward voltage, electric current from the LED anode to cathode, semiconductor crystal gives different colors of light from ultraviolet to infrared, the strength of the light and the size of the current. However, due to the LED light power is small, generally only indication, cannot be used for lighting. For lighting purposes, it is only in recent years the new things.

the LED power is very small, usually many LED only to make array type,

in the form of a little big as a practical light. However, so the cost will be rising rapidly. Because a high quality LED price about 1. 5 yuan, dozen gather together far more than the price of the incandescent light bulb. Is due to the LED brightness and current, the input current, the greater the luminous intensity is higher, therefore, to improve the LED rated current, improve the light output power for the manufacturer the focus of research and development. Only to improve the single LED power only, can reduce the number of the LED array, or even just a single LED, to reduce costs. At present, the lighting industry has developed a single white leds, luminous efficiency has reached 15 lumens per watt, equivalent to incandescent lamp luminous efficiency

.

in 2004 Beijing auto show, the French valeo company shows the use of four LED brake light made of high technology, and to implement all the tail with an LED light function, including the parking lights, small lights, turn lights, fog lamps and the reversing light, etc. This kind of LED technology is applicable to all the tail lights function. In ford motor show on the stage, facing the future Chinese market fox ( 聚焦) Concept car headlights and rear light LED technology is adopted. Some predict that the next few years LED luminous power and cost of these two bottlenecks will be solved. In this way, not only automotive lighting, and even the lighting industry as a whole will be a major change.

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