Automobile light source in the field of lighting occupies a pivotal position, the output of the total output of about 10% of the total output of about. If all the lighting of a car for LED, about the need to use the 400~600 LED. in fact, as early as 10 years ago, LED on the road to enter the automotive field. At present, the proportion of LED in the vehicle and external lighting source has exceeded the 80%.
Environmental protection and durable LED headlights horizon
Automobile headlamp for LED, has always been a hard nut to crack. Because the lighting distance and brightness, LED little for headlights. The heat dissipation problem can be effectively used by using high efficiency drive.
"There is no doubt that, most of the car headlights are still incandescent lamps." Linear Technology Corporation power products marketing director Tony Armstrong frankly said, "however, this advantage from now start will be subject to pressure from high intensity discharge (HID) light and high brightness (HB) LED headlights." HID lights in the late 90 's first used as a car headlight. However, this kind of lamp production and manufacturing is very expensive, so their use has been limited to high-end cars.
"At present about 15% of the new car is equipped with HID." A Morimi semiconductor automotive product marketing engineer Decloedt Paul estimates. But because of the HID light output is too strong, the close of the car, pedestrian constitute a dazzling risk.
In addition, the HID starts at 35000 volts of high voltage, may interfere with the car audio and other appliances. According to the test of xenon lamp xenon lamp owners said, in rain and fog weather conditions are relatively poor penetration. Decloedt Paul said: "it doesn't feel as much as a halogen lamp."
Therefore, Armstrong Tony is more optimistic about HBLED, he believes that HBLED will replace the HID in front of the lamp. He said: "the HB LED headlights in the growth 10 years will appear under a high rate."
The main bottleneck of LED light and front light is thermal management
It is not difficult to find, LED headlights appear mostly in high-end vehicles, especially cars are more common. Decloedt Paul said: "the use of LED before lighting can get more changes in the vehicle styling." Because LED headlights than incandescent lamp, HID more compact car, the overall design can be more streamlined. Decloedt Paul further pointed out that the "compact" is not just the size of the LED itself is smaller, but also the optical components and electronic circuits are also the use of LED and the corresponding weight.
In addition, LED has many other advantages, such as instantaneous conduction, do not need to preheat, more easily control the brightness, etc.. In addition, don't forget the killer broke into the LED lighting industry, long life. Because the LED long service life, eliminating the "replace headlamp bulb" problem.
Automobile industry energy saving and environmental protection wind blowing, the emergence of LED happens to meet the requirements of green and efficient environment. "LED is a green light source, the spectrum is good, there is no excess infrared, ultraviolet spectrum, no harmful substances, mercury, radiation is also very little." Shenzhen secomtel Co., Ltd Senior Application Engineer Liu said, LED light source with higher lumen, and LED is solid state lighting, and HID lamps of different, no movable wearing the quartz glass and other components, with excellent shock resistance and failure is very low, almost maintenance free.
LED headlight brightness is still controversial
In the standard LED headlight Lexus RX450h forum, is hot RX450h LED headlamp. "Even on the bumper car in front of the timbre, the tangent is very pale blue light type, even my headlight more than light degree of recognition is better than it." A road RX450h users so describe the actual effect of LED headlamp. And another rx450h owners retorted, "as long as it is to open the rx450h owners must be very clear, super bright LED headlights, very focused, although the side did not seem very bright. HID is also more concentrated than the LED light source, especially the red green light stopped at the front of the car insurance is very bright, open road is very safe and bright." The original owners for double B fans (BMW, Benz), since the Lexus transform.
For the comparison of the performance of LED headlamps and hid, more good to find two cars of the original factory equipped with hid and LED headlights models in 17:30 test in the evening. The test results from cement wall outside of the 20m display, LED lamp is brighter than HID, but slightly back LED as HID headlights.
LED consumes per unit of energy produced by the light output is indeed higher than the incandescent lamp, but a single LED to LED, the optical output is not so prominent. In order to obtain enough brightness, we must adopt the way of LED module lighting. "A LED module can not provide enough light for the far light and near light function. Therefore, you need to close each beam and beam functions using multiple LED modules." Paul decloedt pointed out that is due to the automobile headlight beam applications, each LED module needs an optical component (lens or mirror). "This is a major cause of LED beam lights and high beam price is still more expensive." In addition, due to the characteristics of modular LED lighting has also led to cars and difficult to define the multiple module of LED lamp is damaged.
LED lamp cooling difficult. In addition, after the test of 5 minutes, LED headlamp temperature is very hot. This has exposed another drawback of LED: heat dissipation. Paul Decloedt said, the main bottleneck of LED light and front light is thermal management. After LED fever, not only the brightness will be reduced, but more importantly, its service life may be significantly shortened.
Tony Armstrong is just a power car manufacturer LED headlight system. Each headlight system includes optimized for all lighting needs five LED lamps, namely the dipped beam, high beam lamps, steering auxiliary lamp, daytime running lights and turn signal indicator. Power standard headlights will generally require 35W to 50W
