Energy and environmental issues have always been two major problems that plague the world. In 1998, US lighting used 36 billion yuan of electricity, accounting for about 20% of energy consumption; C02 emissions generated during power generation reached 112 million tons; global lighting consumption was 230 billion US dollars, and C02 generated during power generation reached 410 million tons; At the end of 2002, China's lighting power consumption was about 200 billion kilowatts, which consumed a lot of coal and oil, and the exhaust gas generated at the same time polluted the environment. Therefore, environmentally friendly and energy-saving LEDs will gradually enter the field of lighting, which will help alleviate the energy crisis and improve the status quo of environmental pollution.
Advantages of 2LED Many large cities such as Shanghai have decided to close most of the nightscape lighting due to the peak of electricity consumption in summer, which has caused many tourists who come here to disappoint. To enjoy the night of the night on such a summer night, LED is a good choice.
In decorative lighting, LEDs show an unparalleled advantage.
2.1 rich, colorful colors. At present, color LED products have covered the entire visible spectrum, and have good monochromaticity and high color purity. The luminous efficiency of red and blue LEDs can reach 20lni/W, and the luminous efficiency of LEDs in the red-orange range is as high as 100lm/W. The traditional way to obtain colored light is incandescent lamps and filters, and the efficacy of incandescent lamps is 820ltn/W. The transmittance of the filter, such as the transmittance of the red filter, is 0.06, so the final light efficiency is much lower than that of the colored LED. The main characteristics of several LEDs in Table 1 are the wavelength of the center wavelength of the color material (nm) ( Cd) Light output light effect Red red - orange yellow green blue LED response time is very short, usually several ms, can instantly reach the full light output. If you use a combination of three primary color LEDs, you can change the color instantly, which is a good choice for dynamic lighting such as fountains. It is also possible to dim the LEDs, use a combination of three primary colors, and use PWM (PulseWidthModulator) to achieve color gradation, such as for exterior decoration of buildings, more dreamy.
LEDs are low voltage devices with a robust structure. The working voltage of neon lights is tens of thousands of volts, and it is also easy to leak, damage and other serious phenomena; text graphics made with neon lights are prone to lack of pen and less stroke. Therefore, LED can replace neon to create billboards, which can not only reduce power consumption, but also avoid the negative effects of advertising caused by partial negligence of neon lights.
LEDs have a strong directionality of light, and are small in size, making lamps more efficient and easy to hide when installed. It is an example of LED used for landscape lighting.
2.5LED has a long life span of up to 100,000 hours. The general light source is only a few thousand or tens of thousands of hours. The maintenance cost of the equipment is greatly reduced.
This is a four-corner pavilion that uses LEDs to illuminate the top of this antique building, embedding the luminaires in the grooves of the roof, making the building's outlines very clear and well-defined. At the same time, because the LED lamps are small and concealed, they are not easy to be noticed even during the daytime, and do not destroy the overall style of the building like traditional lamps.
The table below compares LEDs with conventional luminaires when illuminating this building.
Table 2 Comparison of LED lamps and traditional lamps Use lamps LED traditional lamps and lanterns Variety LED spotlights LED buried lights Buried lamps Fluorescent lamps Quantity Single lamp power (w) Total power (w) Average life (h) Total power (W) From the table It can be seen that the use of LED luminaires, compared with the traditional luminaires, the former consumes only 22% of the latter. If the lights are turned on for 5 hours per day, the LED luminaires can be used for 50 years; while the traditional luminaires have a low service life. In 10 years, its maintenance costs have therefore far exceeded LED lamps.
2LED application in bar lighting The bar at the Anna Hotel in Munich, Germany has a distinctive lighting system: all light sources are LEDs. Since its opening in January 2002, customers have been in constant stream, mostly by the bar. The lighting effect is attracted.
Two LEDs. A total of 1,800 Superflux and 24 Luxeons are used to achieve a different style of lighting through the use of different layouts and optics.
High-brightness LEDs are small in size and have greater flexibility in applications. By combining, arranging, and using a certain control system, different colors, atmospheres and moods can be produced. For example, it shows two different atmospheres produced by LED lighting in a room.
4 Conclusion Despite the low luminous flux and high cost of single LEDs, LEDs are difficult to accept in everyday lighting. But the unique advantages make LEDs more and more applications. With the further development of LED, we will see various LED lighting products, street lights, indoor lighting and so on.
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