Automotive headlamp bulbs made of LEDs have significant advantages such as long life, high brightness, and long projection distance. They have become the preferred source for large-area replacement of halogen and xenon lamps, and adaptive vehicles made of multi-beam smart glare LEDs. The headlights have also become the trend of the next generation of headlights for automobiles.
As can be seen from Figure 1, from the perspective of road lighting, the headlights of the car with LEDs are obviously superior to the headlights of the car using halogen lamps in terms of vision, brightness and projection distance. The life of the former is several dozens of the latter. Times.
â–² Figure 1: The above picture shows the near (left) far (right) light effect of the car headlights with halogen lamps. The following figure shows the near (left) far (right) light effect of the car headlights with LEDs. [from Fire Ding Intelligent Lighting]
Although LEDs are a new kind of illumination source, in terms of auto parts and aftermarket, because the original lamp body system of the car headlights must be used, the dimensions and fixing methods of the LEDs headlight bulbs are designed. Interfaces, power and control, illuminating area shape, brightness and luminous flux should be as consistent as possible with halogen bulbs and xenon bulbs.
When replacing halogen bulbs and xenon bulbs, there is no need to make major changes to the lamp body. As a new alternative light source, automotive headlamps using LEDs must provide users with a new experience, not only in terms of longevity and reliability, but also without increasing or even reducing glare. Increase ground illumination and throw distance.
â–² Figure 2: Halogen bulb (left) and xenon bulb (right) [from Philips]
As can be seen from Figure 2, both the halogen bulb and the xenon bulb are linear light sources, and the bright area is about 4-6 mm in length and 1-1.2 mm in diameter. It is ideal as an LED headlight bulb for replacing halogen bulbs and xenon bulbs. The illuminating area should be 4-6mm x 1.1-1.2mm. Obviously, LEDs with linear illumination areas are the preferred source for LED headlight bulbs.
As a mature light source, LEDs have been widely used in lighting, backlight, display and other fields. The glare LEDs are characterized by small size, high current and high reliability. They are mainly used in directional projection lighting, such as automobile headlights and motorcycles. Lamps, pico projectors, stage lighting, portable glare lighting, ultra long distance searchlights, etc. At present, the glare LED package forms for automotive headlights and motorcycle lamps are COBs (short for chip on board), CSP (short for chip scale package)-COBs, 2016-LEDs or CSP-LEDs, high-power ceramics. LED modules for LEDs and automotive headlights.
â–² Figure 3: Car headlight bulbs made with COBs [from 360 images]
Figure 3 shows a car headlight bulb made of COBs. The luminous flux of such a light source can be very high, depending mainly on the size of the light-emitting area. Generally can reach 2000-3000LM. COBs are usually surface light sources and are not linear sources. Even if the light-emitting area of ​​the COBs is elongated into a strip shape, ceramics or superconducting aluminum with good thermal conductivity are used as the substrate, and the limitation of the package form is still unable to achieve the goal of small size, large current, high reliability. Car headlight bulbs made with COBs, because the shape of the light-emitting area is far from that of halogen bulbs and xenon bulbs, many light from the linear area becomes harmful stray light and glare, which cannot be improved. The effective illumination of the road surface also destroys the light shape and brightness distribution of the projected beam. Simply increasing the luminous flux not only brings more serious heat dissipation problems, but the severe glare and deformed light intensity distribution will become a safety hazard. Automotive headlamp bulbs made with COBs, although low in cost, have poor reliability and light shape and can only be primary products and have been eliminated by the mainstream market.
â–² Figure 4: Automotive headlight bulbs made from high-power ceramic-based LEDs. [Photographed from purchased products]
Figure 4 shows a car headlight bulb made from high-power ceramic-based LEDs. High-power ceramic-based LEDs are small-sized, high-current, high-reliability and bright-light LED light sources, mainly represented by CREE's XHP35, XHP50, XHP70, and XML-2. Because high-power ceramic-based LEDs have lenses with conventional LEDs and vertical chips that often use high-efficiency, their luminous efficiency is usually higher than other LEDs. The ceramic substrates used, due to their low thermal resistance, enable high-power ceramic-based LEDs to be used normally under over-driven conditions.
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