Except for the power and brightness, to identify whether a headlight is good or bad, we need to focus on these four factors.
- LED Bulb Chips
- LED Light Material
- LED Light Fan
- Internal or External Drives
Led Bulb Chips:
You can see LED chips in every LED light fixture, from bulbs to tubes. LED chips play an important role in determining light quality. They control the brightness output as well as the the cutting line of light beam pattern. It is conceivable that the choice of chips is very significant. So far, there are some famous manufacturers of chips in the world, for example: Cree, Osram, NICHIA, Lumileds, ToyodaGosei, Agilent, Agilent, LUMILEDS, SSC, SemiLEDs, SDK.
CREE company located in the United States, the products are based on silicon carbide (SiC), gallium nitride (GaN), silicon (Si) and related compounds, including blue, green, ultraviolet light-emitting diodes (LED), near ultraviolet laser, radio frequency (RF) And microwave devices, power switching devices and silicon carbide (SiC) epitaxial wafers suitable for production and scientific research.
It is the world's second largest manufacturer of optoelectronic semiconductors, including lighting, sensors, and image processors. The company is headquartered in Germany, with R&D and manufacturing bases in Malaysia, with about 3,400 employees and sales in 2004 of 4.59 billion euros. The most famous product of OSRAM is LED, which is only a few millimeters in length, has multiple colors, low power consumption, and long life.
Nichia Chemicals, a famous LED chip manufacturer, a Japanese company, was established in 1956. It developed the world's first blue LED (1993), the world's first pure green LED (1995), and has built factories all over the world. Subsidiary.
4. Toyoda Gosei
Toyoda Gosei, headquartered in Aichi, Japan, produces auto parts and LEDs. LEDs account for about 10% of revenue. The white light LED jointly developed by Toyoda Gosei and Toshiba uses a combination of ultraviolet light LEDs and phosphors. Blue LEDs are combined with phosphors differently.
As the world's leading supplier of LEDs, its products provide efficient and reliable light sources for a wide range of products including automobiles, electronic information boards and traffic lights, industrial equipment, cellular phones and consumer products. The high reliability of these components generally ensures that the light source does not need to be replaced during the lifetime of the device. Agilent's low-cost dot-matrix LED displays, a wide variety of seven-segment displays, and Agilent's LED light bar series have a variety of packages and colors to choose from.
Toshiba Semiconductor is a major supplier of LEDs for automobiles, especially for dashboard backlights, car radios, navigation systems, and climate control units. The technology used is InGaAlP with wavelengths from 560nm (puregreen) to 630nm (red). Recently, Toshiba has developed a new technology UV+phosphor (ultraviolet + fluorescent), the LED chip can emit ultraviolet light, and after the phosphor is excited, the combination emits various lights, such as white light, pink, green and other lights.
Lumileds Lighting is the world's leading manufacturer of high-power LEDs and solid-state lighting. Its products are widely used in lighting, televisions, traffic signals and general lighting. Luxeon Power Light Sources is its patented product, which combines the characteristics of small size and long life of traditional lamps and LEDs. It also provides various LED chips and LED packages, including red, green, blue, amber, white and other LEDs. Lumileds Lighting is headquartered in the United States, and its factories are located in the Netherlands, Japan, and Malaysia. acquired the company.
Seoul Semiconductor is the largest manufacturer of LED environmental protection lighting technology in South Korea and one of the eight largest manufacturers in the world (source: StrategiesUnlimited--LED market research company). The main business of Seoul Semiconductor is the production of full-line LED assembly and custom module products, including semiconductor light source products driven by AC power such as: Acriche, side-light LED, top-light LED, slice LED, plug-in LED and piranha (super light) LED Wait. The products have been widely used in general lighting, display lighting, mobile phone backlight, TV, laptop computer, automotive lighting, household items and traffic signals and other fields.
9. SemiLEDs Xuming
is the world's leading high-performance light-emitting diode (HPLED), suitable for general lighting applications. SemiLEDs LED chips are the smartest and most efficient on the market today. Using copper alloy substrates, SemiLEDs have successfully developed and commercialized MvPLED technology (Metal Vertical Photonic Light Emitting Diode). With metal substrate and unique device structure, SemiLEDs' HPLEDs have better electrical and thermal conductivity resulting in higher brightness, efficiency and better heat transfer, suitable for lighting applications including displays, signs, communications, automotive and General lighting.
10. SDK Showa Denko
It is a representative comprehensive chemical company in Japan. It has been developing liquid chromatography since the 1960s and has a production history of more than 40 years. Production of GPC, GFC, special columns for sugar analysis, ion-exchange chromatography columns, affinity chromatography columns, organic acid analysis columns, chiral separation columns and ion chromatography analysis of more than 800 models of various special columns. Showa Denko will develop blue LEDs and green LEDs with the same luminous efficiency in the future, and plans to increase its LED business revenue from 10 billion yen in 2007 to 15-20 billion yen by 2010.
LED Lamp Material & Design
The material and deisgn of the led lamp not only determines aesthetic effect of the head lamp, but also the heat dissipation, durability. The more the lumen output of the LED light, the more the heat it generates, and the larger the required heat dissipation volume of the LED headlight. The thermal conductivity of metals is much greater than that of plastics. High-grade aluminum are better in terms of heat dissipation efficiency of the bulb, overall stability and stunt sense of the bulb. Besides, the materials of substrate and tube also important, the heat dissipation of the copper substrate will be better than that of the aluminum substrate, dual heatpipes are better than single heatpipes, the more fins, the better for heat dissipation.
Of course we wanna make as more fins and heatpipes on Leds as we can, but we couldn't, because the housing space of the OEM headlight is limited, so the bulb size is limited
LED Lamp Fan
LED bulbs with fans are definitely with a better dissipating heat than those without fans. If the bulb is powerful, it needs a fan to dissipate heat. The higher the fan speed, the better the heat dissipation efficiency of the bulb LED, and the lifespan of the bulb will be greatly extended.
Internal or External Driven
Actually the external is not the main factor to ensure the led quality, But when led light starts to work, the driving part will also heat up, With external driven, we can make the power higher, the led brighter, cuz the heat is better than Internal driven. With the internal-driven, the led can be more easily installed and have a better fitment, but the power will be decresase compare to the external one. Therefore, under the same bulb chip, lamp structure and heat dissipation system, the external drive is more conducive to the overall heat dissipation of the bulb and the lasting stability of the vehicle lights.
You need to comprehensively considerate the leds not just the power, when you choosing the led healdights.
We hope this article will help you better choose the right leds