The main technical difficulties of high power LED lighting is heat dissipation, cost considerations need to focus on the use of cost

With the government and the people's awareness of energy saving and environmental protection, and progress of high power LED technology, high power LED is increasingly used in general lighting applications, including landscape lighting, traffic lights, interior lights, miner's lamp, lantern, automotive LED lighting and indoor LED decorative lamp. The high power LED not only can provide brightness, lighting applications required service life, also has the light source color temperature, directional and low maintenance cost (long life), energy consumption, environmental protection, energy saving and less excellent characteristics etc..

For example, there are more than 20 billion global lighting device using incandescent lamp, halogen lamp, fluorescent lamp, the lighting device is used to provide a lot of directional lighting, but their light is the direction of the light use efficiency is relatively low. In the case of domestic spotlights, if not with reflectors, the traditional light is generally only 50% of the light efficiency. High power LED lamps can provide high efficiency directional lighting, the service life of up to 50000 hours.

But the heat problem and a relatively high cost still hinder the two major problems of high power LED lighting applications rapidly growing in popularity. LED has made a lot of improvements in the lumen per watt, but most of the LED's power is converted into heat transfer. In addition, for general lighting, it is necessary to put a few or a large number of LED in a module to achieve the desired brightness. A number of LED concentrated in a limited space, will cause the difficulty of heat dissipation, temperature rise leads to the decrease of LED LED module, the service life, and accelerate the efficiency and reliability of LED attenuation, effects of LED and other components of the driver (general components of the working temperature should be controlled at 80 DEG C). Increase in temperature, but also to the LED output light wavelength changes, changing color characteristics, it may affect the automotive lighting.

There are several alternative scheme "solve the problem of heat dissipation, including the selection of high quality solutions; heat control, when the temperature is increased to reduce current, to reduce power consumption; choose reasonable thermal design, etc.. With 12 years of experience in the business of LED (Arrow) Electronics Asia Pacific lighting product development director Wu Bingyan pointed out that, for example, Ai Rui electronic agent CREE products. In Lumileds, Cree and Nichia three high-power LED manufacturers, Cree's products have a significant advantage in terms of brightness and efficiency. Cree's latest product requires only 100 1W of power to provide the brightness of the same brightness, the power consumption is less, and its unique structure is also conducive to heat dissipation. "

Cree XLamp LED can maintain their original luminous flux of seventy percent in 50000 hours, far greater than the ordinary outdoor lighting equipment use time. In addition, XLamp XR-E LED CRI (color rendering index) can reach 80, while the sodium light-emitting device can only reach 20 or lower than. XLamp XR-E light emitting diode provides a standard level of code, luminosity at 350 Ma per diode can reach 100 lumens, with high output high, it only needs less than 80 of the XR-E light emitting diode can achieve the general requirements for street lighting.

For consumers generally believe that LED cost is relatively high, Wu Bingyan also has a different view: "the brightness in the same circumstances, the LED spot price is about 10 times the traditional lamp, but this is not a complete portrayal of high power LED lighting costs. In fact, many people only see the cost of the LED lamp itself, without considering the overall cost of use. "

He explained, in addition to the cost of a single lamp use cost, power consumption and cost, the cost of replacing the lamp (before the need to repair or replace the LED lamp has long service life and environmental protection cost (LED) lamp to deal with waste packaging and lamps less). If these add up, in the long run, long life, high power LED lamp with greater economic benefits.

In high power LED prices fell very quickly. According to Wu Bingyan introduction, the price of high-power LED is generally 5 cents per lumen, and now is about 4 cents per lumen. When the expected price of LED lights for the traditional lamp competition 3 ~ 5 times, the amount of use of the LED lamp will have a big leap, this time may be after a year or two years later, the key to see it in the brightness performance on the speed of development.

"Is the largest market for semiconductor lighting applications, with the brightness of the LED increases, LED will continue to open up new fields of application. In addition, in order to save energy, protect the environment, incandescent lamp in many countries and regions will be banned in Europe such as power consumption, from the beginning of 2010 to prohibit the use of incandescent lamp, which shows the high power LED lighting applications market prospect. Wu Bingyan said.

Arrow actively to promote the high power LED lighting applications and the layout, the company for the first time in the line of business model set up a lighting business team, almost all of the devices and components required for high-power LED lighting applications and provide, including high power LED Cree company, IRC company; radiator; International Rectifier Corporation (IR), Fairchild, Linear, MicrEL, NSC, ST, TI and so on, the company's Atmel, Freescale, LED drive; NXP semiconductors (NXP), TI micro controller and Tyco protection element, Avago RGB module etc..

Arrow Electronics Technology also offers value-added services for LED lighting applications. They are based on the Freescale 8 bit microcontroller MC9R