In order to be successful in the market, the cost of upgrading lighting to LED technology must be kept to a minimum. Undoubtedly, the option of reusing existing infrastructure must also be the most market-friendly option. Provides greater design flexibility for dimming and changing lighting colors, making it ideal for applications such as architectural lighting, interior lighting and dimming, energy efficient street lighting, and outdoor lighting, where lighting can be remotely controlled. These applications can bring great ＆#118alue-added space to users, however,

In remote control applications, the most cost-effective upgrade of Lixin's products is the control of LED lighting cabling. Fortunately, there are two technologies that can be used to eliminate this expensive upgrade cost: PLC technology can support long-distance communications, but may cause problems when an AC line breaker or transformer does not allow free data flow. Although wireless communication does not have this problem, the communication frequency is limited to the exemption band and the wireless communication distance is also limited. In some cases, the best of both worlds can be combined to get the best solution: powerline communications without transformer blocking and cross-transformer design with wireless connectivity.

(B) LED luminous principle

LED mainly consists of PN junction chip, electrode and optical system. The luminous body - the area of ＆#8203;＆#8203;the wafer is 10.12mil (1mil = 0.0254mm2), the current international emergence of large chip LED, the chip area of ＆#8203;＆#8203;40mil.

The light emission process consists of three parts: carrier injection under forward bias, recombination radiation and light energy transmission. A tiny semiconductor chip is encapsulated in a clean epoxy. As the electrons pass through the wafer, the negatively charged electrons move to and recombine with the positively charged hole region, generating photons as the electrons and holes disappear. The larger the energy (band gap) between electrons and holes, the higher the energy of photons generated. The energy of the photon in turn corresponds to the color of the light. In the spectrum of the visible light, the blue light and the purple light carry the most energy, and the orange light and the red light carry the least energy. Since different materials have different bandgaps, different colors of light can be emitted.

LED lighting source will be the mainstream of high-brightness white LED. At present, the white LED has been commercialized mostly two wavelengths, that is, with blue single crystal YAG yellow phosphor mixed with white light. The future is more optimistic about the three-wavelength white LED, that is inorganic UV chips plus red, blue and green phosphors to produce white light mixed with three colors, it will replace fluorescent lamps, compact energy-saving fluorescent lamps and LED backlight market.

(C) LED light source of the basic characteristics

1, high luminous efficiency

LED after decades of technical improvements, its luminous efficiency has been greatly improved. Incandescent, halogen light efficiency of 12-24 lumens / watt, fluorescent 50 ~ 70 lumens / watt, sodium 90 ~ 140 lm / watt, most of the power into heat loss. After the improvement of LED luminous efficiency will reach 50 ~ 200 lm / W, and its good monochromatic light, narrow spectrum, no need to filter directly issued colored visible light. At present, all countries in the world are stepping up efforts to improve the research on LED luminous efficiency and its luminous efficiency will be greatly improved in the near future.

2, less power consumption

Single LED power 0.03 ~ 0.06 watts, the use of DC drive, single-tube drive voltage of 1.5 to 3.5 volts, current 15 ~ 18 mA, the reaction speed, high-frequency operation. The same lighting effect, the power consumption is one-eighth of the incandescent bulbs, fluorescent tubes half, Japan estimates, such as the use of light-efficient than fluorescent lamps even twice as long as LED replacement half of the Japanese incandescent lamp and Fluorescent light. Each year can save equivalent to 6 billion liters of crude oil. On the bridge guardrail lamp, the same effect of a fluorescent lamp 40 watts, and the use of LED power of only 8 watts each, and can be colorful changes.

3, long service life

The use of electronic light field radiation, filament light easy to burn, heat deposition, light attenuation and other shortcomings. The use of LED lights small size, light weight, epoxy resin package, can withstand high-intensity mechanical shock and vibration, not broken. The average life expectancy of 100,000 hours. LED lamp life of up to 5 to 10 years, can greatly reduce the cost of maintenance lamps and lanterns, to avoid the frequent replacement of the pain.

4, safety and reliability

Low heat, no heat radiation, cold light source, you can safely touch: precise control of light and light angle, light color, soft, non-glare; does not contain mercury, sodium and other substances that may endanger the health. Built-in micro-processing system can control the luminous intensity, adjust the light way to achieve the combination of light and art.

5, is conducive to environmental protection

LED solid-state light, shockproof, impact-resistant not easily broken, recyclable waste, no pollution. Small light source, can be freely combined, easy to develop into light thin short lighting products, but also easy to install and maintain.

Of course, energy saving is the main reason we consider using LED light sources. LED light sources may be more expensive than traditional light sources, but with a one-year energy saving to recover the investment of light sources, several times the annual energy saving net benefit period of 4 to 9 years .

Second, the application of LED lighting technology prospects and trends

For a long time, due to the low efficiency of LED light, its applications are mainly concentrated in various display areas. With the emergence of ultra-high brightness LED (especially white LED), the application in the field of lighting becomes possible. According to the forecast of international authoritative agencies, the 21st century will enter the era of new lighting source represented by LED, which is called the fourth generation of new light source.

(A) the prospects and trends

At present, the lighting consumption accounts for about 20% of the total power consumption, greatly reducing the lighting power is an important way to save energy. To achieve this goal, the industry has studied and developed many kinds of energy-saving lighting fixtures and achieved certain results. However, far from being "green lighting", it is imperative to develop and apply new light sources that are more efficient, reliable, safe and durable. LED with its inherent advantages are attracting the world's attention. The United States, Japan and other countries and Taiwan have predicted the LED lighting efficiency. 55% of American incandescent lamps and 55% of the fluorescent lamps are replaced by LEDs, saving 35 billion U.S. dollars in electricity bills each year and 755 million tons of carbon dioxide emissions each year. Japan's 100% incandescent lamp replaced by LED, can reduce 1 to 2 nuclear power plants generate electricity, saving more than 1 billion liters of crude oil consumption. In Taiwan, 25% of incandescent lamps and 100% of fluorescent lamps are replaced by white LEDs, saving 11 billion kWh annually. As early as 1998, Japan prepared the "21st Century Plan" and conducted practical research on LED light sources for lighting in the new century. In recent years, Japan's Nichia Chemical, Toyota Synthesis, SONY, Jiayou electrician have LED lighting products come out. World-renowned lighting companies such as Philips, Osram, GE, also invested a lot of manpower and resources for LED lighting product research and development and production. US GE and EMCORE co-founded a new company that specializes in the development of white LEDs to replace incandescent, compact fluorescent, tungsten halogen and automotive lights. Osram Germany and Siemens to develop LED lighting systems. Taiwan's current LED production is second only to Japan listed in the United States, starting from 1998 to invest NT $ 600 million in related development work.

LED development history has been for decades, but the application of lighting in the field or new technology. With the rapid development of LED technology, its luminous efficiency gradually increased, LED application market will be more extensive, especially in the context of the global energy shortage concerns once again rising, the prospects for LED lighting market is more subject to global attention, was The industry believes that becoming the most favored market in the next 10 years and the largest market will be the largest potential replacement of incandescent, tungsten and fluorescent lamps.

(B) lighting applications exist in the main technical issues

In recent years, LED luminous efficiency is gradually increased, the commercialization of the device has reached the level of incandescent lamps, landscape lamps with white LED luminous efficiency close to the level of fluorescent lamps, and steady growth. However, there are still some technical problems in the application of lighting to popularization:

First, the luminous flux needs to be further improved. With LEDs as the lighting source, more light must be emitted and higher energy efficiency must be achieved.

Second, LED light and natural light is still a gap. Incandescent light with a very strong yellow light composition, giving a warm feeling. The white LED white light with blue light composition, in this light lighting, people's vision is not very natural.

Third, the higher the price. This is the main reason for the popularity of LED lighting. However, in recent years, due to the improvement of the wafer technology, the manufacturing cost is dropping sharply. In the recent three years, the price of LED has dropped by nearly 50%, and it is moving towards high efficiency and low cost. This is the application of LED in lighting field Provided favorable conditions. In addition, better cost performance can also make up for the lack of cost price.

Third, LED lighting technology in the lighting environment

As the LED light source with high luminous efficiency, low power consumption, long life, strong safety and reliability, is conducive to environmental protection and other features in recent years in the city lighting environment has been widely used. Has been used in digital Symphony, fence lighting, square lighting, garden lighting, flood lighting, underwater lighting series. Many cities use LED light source lighting technology in the construction of urban lighting environment, has produced good results and has accumulated rich experience. Such as Guangzhou Power Building, Guangzhou Hedong Bridge, Guangzhou Industrial and Commercial Bank Building, Zhuhai Yingbin Road Lighting Project, Dongguan City Center Light Project, Zhengzhou Henan Medical Overpass, Shanghai Yan'an Road Lighting Project, Changde Danyang Flyover, Nantong Communication Tower Lighting projects.