Advantages and uses of LED street lighting
The emergence of high-brightness LED is of epoch-making significance, and it will be one of the greatest inventions of mankind after Edison invented the incandescent light bulb. The earliest developed LEDs can only emit red light and are used for indicator lights in electronic equipment.
Today, LEDs can emit light beams of red, yellow, blue, green, orange, amber, blue-green, red-green, yellow-green, pure green, emerald green, and white. In major cities in our country, the dazzling brilliance of LED has been seen everywhere, and LED is changing our living and working environment.
After the semiconductor technology triggered the microelectronics revolution, it is giving birth to a new industrial revolution - the lighting revolution. LED has become a shining symbol of the information age, and will gradually replace traditional lighting technologies such as incandescent and fluorescent lamps.
Outstanding advantages, wide range of uses
Those who have been to Times Square in New York, the United States may not forget that the high-level Coca-Cola advertisements are clear, colorful and lifelike, and the images under the control of the computer are endlessly changing.
In fact, as early as the early 1990s, billboards or road indicators with LED lighting appeared on Munich Airport in Germany and highways in France and Spain. During maintenance, there is no need to climb up to open the light box, just open the light guide on the ground. the light source box, the light source can be replaced.
LED is charming and has many advantages. In addition to long life and low energy consumption, LED has three advantages: first, it is very flexible in application, and can be made into various forms of light, thin and short products of point, line and surface; second, it has better environmental protection benefits, because the spectrum No ultraviolet and infrared rays, neither heat nor radiation, it is a typical green lighting source, and the waste can be recycled without pollution. Third, the control is extremely convenient, as long as the current is adjusted, the light can be adjusted at will, and the combination of different light colors There are many changes, and the use of sequential control circuits can achieve a variety of dynamic changes.
LEDs can be used not only for large advertising displays, but also for architectural and traffic lighting. As the night scene lighting of key urban buildings, LED can play a great role in outlining the outline, and can simulate any color, and the loss of luminous flux and maintenance costs are also greatly reduced. Due to its small size, LEDs are suitable for making line lamps, and LEDs are used as floor lamps to indicate directions, trails and driveways, which are safe, reliable and durable. In the past, the most enchanting neon lights in the night sky of the city may be the neon lights. However, because the neon lights are the most easily damaged, we often see that the pictures and text displayed by the neon lights are always missing arms and legs. If LEDs are used instead of neon lights as display signs, not only can the regret of incompleteness be avoided, but also the realm of freedom can be achieved.
Initially, LED was only used as a miniature indicator light and was used in high-end equipment such as computers, audio and video recorders. With the continuous advancement of large-scale integrated circuits and computer technology, LED display screens are rapidly emerging. As a new generation of display media, LED has become A beautiful landscape in modern cities, it is widely used in various public occasions. In recent years, LED has gradually expanded to the field of general lighting, from stock market to stock machine, from notebook computer to digital camera, from PDA to mobile phone, from indoor lighting to car lights, LED is everywhere.
The reaction speed of a single element of the organic LED display is 1000 times that of the LCD liquid crystal display, and it can also be looked after under strong light, and it can adapt to the low temperature of minus 40 degrees. It is reported that a foreign company is developing a head-stealing viewfinder into which a high-resolution organic LED display the size of a fingernail is placed. Wearing this translucent helmet display, pilots can effortlessly view various flight data ; the surgeon performing the operation can see complex diagnostic images without ever leaving the operating table; the flight mechanic can see the maintenance manual of the corresponding component as far as the eye can see when overhauling the aircraft. What's even more exciting is that wearing glasses made of organic LED display, you can also watch movies happily, and the viewing angle can reach 160 degrees.
LED lights up the future
In modern cities, light pollution caused by high-power gas discharge lamps, floodlights, neon lights, light box advertisements and other light sources has caused serious harm to human beings, the natural environment and astronomical observations. In the 21st century, solving light pollution is an urgent topic for lighting technology to break through. LED came into being and has a bright future.
The emergence of white LEDs is a substantial step for LEDs from the identification function to the lighting function. White LED is the closest to sunlight and can better reflect the true color of the illuminated object. Therefore, from a technical point of view, white LED is undoubtedly the most cutting-edge technology of LED.
The application market of white LED will be very wide, and it is also the "killer" to replace incandescent tungsten bulbs and fluorescent lamps. At present, white LEDs have begun to enter some application fields, and products such as emergency lights, flashlights, and flashlights have come out one after another. However, since the price is very high, it is difficult to popularize. A set of white LEDs with a brightness equivalent to a 40-watt incandescent lamp is priced at $220. The premise of the popularization of white LEDs is that the price will drop, and the price drop must be possible when white LEDs form a certain market size. There is no doubt that both The fusion ultimately depends on technological progress.
According to the forecast of the US Department of Energy, around 2010, 55% of incandescent and fluorescent lamps in the United States will be replaced by LEDs, and the annual power saving value can reach 35 billion US dollars, which may form a large industry of 50 billion US dollars. Japan proposed that LED will replace traditional incandescent lamps on a large scale in 2006. In order to seize the commanding heights of the future market, the world's three major lighting industry giants, such as General Electric, Philips, and Oslam, have taken action and cooperated with semiconductor companies to establish LED lighting companies. The goal is to increase LED luminous efficiency by 8 times by 2010. Prices are 99% lower.
The battle for the future lighting market has already started. my country has a huge lighting industry and lighting market. Last year, the sales revenue of lighting appliances in my country was 44.5 billion yuan, and the export earnings were 4.3 billion US dollars. Experts predict that the output value of my country's light-emitting diode industry will reach 3 billion to 4 billion US dollars within three years. In the field of semiconductor light-emitting devices, the gap between my country and the world's advanced level is relatively small. The first LED independently developed by my country is only a few months later than the world's first LED, and the overall technical level is only about 3 years behind that of developed countries. In order to adapt to the rapidly growing market demand, my country has listed LED as 31 electronic products encouraged by the state and 20 electronic products and technologies encouraged by foreign investment.
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