Lighting Research Institute of Fudan University, Professor Chen Dahua said, the emergence of artificial light by the international scientific community recognized as a milestone in the start of modern civilized society, while the 21st century will be a result of LED (light emitting diode) the emergence of a new era of solid light. Although the global LED market is still in its infancy, but experts predict: If LED can achieve a further breakthrough in technology ,10-20 years will replace incandescent lamp, energy saving lamps and other lighting sources, dominate the lighting industry.
LED obvious advantages
LED (Light-Emitting-Diode Chinese meaning light-emitting diode) is a way to visible light energy into the semiconductor, it changes the energy-saving lamps and incandescent tungsten light emitting three basic principles of dye, while the use of electric light. According to the analysis, LED is very obvious characteristics, long life, high luminous efficiency, no radiation and low power consumption. LED spectrum almost entirely concentrated in the visible light spectrum, the luminous efficiency of up to 80 to 90%. Journalists will also LED and incandescent, spiral energy saving lamps and T5 fluorescent trichromatic do some comparison results showed that: ordinary incandescent light efficiency 12lm / W, life expectancy is less than 2000 hours, spiral energy saving lamp light efficiency 60lm / W, life expectancy is less than 8000 hours, T5 fluorescent lamps compared to 96lm / W, life is about 10,000 hours, while the diameter of 5 mm white LED is 20 ~ 28lm / W, life can be greater than 100,000 hours. It was also predicted that the future of LED lifetime limit will be infinity.
Most people believe that energy saving lamps can save energy 4 / 5 is a great initiative, but also energy saving lamp LED than 1 / 4, which is a solid light source greater reform. In addition, LED also has other advantages, light, high quality, essentially no radiation, typical of the green lighting; reliable and durable, very low maintenance costs and so on. Because LED light source has over other solid features can not match, 10 years after the LED lighting industry will be the main source.
LED lighting is difficult to fulfill
Despite the many advantages of LED with the above, but it has been 5 to 6 years of development has not yet been accepted by the market and consumers. Beijing pine industry analysis in a report to: the development and production of domestic white LED lighting is also far short of requirements.
Low power is the bottleneck.
It is understood that, at present, the market's single LED 1W less power in general, but no high-power LED, which is LED lighting is difficult to immediately become the biggest bottleneck. Factors affect the LED LED components. As a result of a small LED light features unlike incandescent and fluorescent lamps, as it exists white light color uniform and other issues. That there is no production of white LED device manufacturers to provide detailed information on component failure or technical specifications, not to use LED lamps lighting standards.
According to expert analysis of China LED, LED in the light-emitting efficiency, color temperature and color rendering index of operability has its limitations and slow pace, high flux, high luminous efficiency white LED is the future course of development need to be resolved technical problems.
In response to these challenges, the International Commission on Illumination as early as April 6, 2000 -8 at the London Technical Committee plenary meetings devoted to LED-related technology to crack. Past couple of years China has also carried out further research on the LED, has yielded some results, but neither the function or accuracy, are unable to meet the needs of LED as lighting.
Pass prices
In addition to technical bottlenecks, price is the LED lighting is difficult to fulfill the main factors. Chapter Road, Bo that, LED has been most understanding, most people have been good, but the high prices prompted many consumers it is difficult to be accepted.
According to industry sources, the current single yellow LED about 0.6 yuan / month, green and blue single LED at 1.8 yuan / month or so, the price of white LED has reached 2.2 to 5.5 yuan / month so. If the combination of dozens of single LED, the cost will be greatly increased, such as an LED installed in the lawn, the lawn of their normal price is equivalent to several times, so the price has been a breakthrough in LED market passes. Taiwan's largest manufacturers of high-brightness light-emitting diodes, director of the League of Nations Ze Peng said photoelectric technology, LED lighting to become the next mainstream source, it must be moving in the direction of a large lumen, be possible to reduce the cost of the market possible breakthrough.
Character LED
The "occupation" of the city
While LED lighting has not yet reached the requirements, but because of its light color is rich and long life, most of the lights and the neon lights and other decorative lighting are applied LED.
Meanwhile, with the expansion of urban landscape lighting, green lighting, especially after the national advocacy, LED has a very broad market. Urban Landscape Lighting is a huge project, which requires the hundreds of kilowatts of high-intensity discharge lamps to give the city's lighting set the tone, also need such a colorful LED, lighting, flexible means to decorate. One of the most embodies the LED personalized than the details of the carving and characterization, the LED will be its energy-saving, reliable, abundant and diverse forms of light and color, etc., play an active role in the urban landscape lighting, especially when high-power LED have been developed and a light source, it will replace the existing large-scale energy saving lamps and incandescent lamps and "occupied" the entire city.
Since LED has broad market prospects, the world experts have been trying to find Bottleneck. In just 5 to 6 years, the world's research and development and application of white LED has made remarkable achievements.
It is understood that China has developed various properties of the yellow phosphor, the blue chips by different light emission wavelength; developed a variety of high color temperature of 5000K or more, high color rendering index Ra> 80 high-brightness white LED. According to reports, the results open to foreign countries recently have not been reported. June of this year, Taiwan launched the League of Nations the world's first optical 5A drive while the power is still available capacity of the high brightness LED, the brightness as high as 200lm, about 125 low-brightness diode combined. In a foreign country, in 2001, Mitsubishi Cable Industries, and Stanley Electric plant clubs to develop a more efficient 382nmUVLED, its performance is better than the current 395nmLED; recently, University of Southern California developed the emission peak from 305nm to 340nm UV LED and so on.
Expected to become the fourth generation of the new white LED lighting, green lighting to energy-saving purposes. According to the experts predict that in 2005 white LED light effects to achieve 50lm or more, will enter commercial lighting; over 2010 to reach 150lm, will begin to enter the home lighting.
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