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What are the advantages of LED streetlights in streetlights
Sep 15, 2018

What are the advantages of LED streetlights in streetlights?

The LED street lamp designed by special light shape is applied to the lamp of the street lamp, which can offset the illumination angle of the lamp and improve the lighting utilization rate of the roadside; according to the aspect ratio of the rectangle, the aspect ratio can be 2:1. The spot is so that there is no shadow between adjacent spots, and a bright light with uniform illumination can be formed on the road surface, which is more in line with the current lighting design of the traffic road, and can be satisfied without raising the height of the pole. Wide illumination range, but also improve the lighting efficiency of the luminaire, reduce the lighting power density of the road, so as to achieve energy-saving and green high-power LED street light for road lighting, compared with the traditional high-pressure sodium lamp is unparalleled Advantages: 1. Different illumination mechanism, because LED street lamp is a kind of semiconductor device, its effective life can reach 50,000 hours (that is, after 50,000 hours, the light decay is less than 30%), far higher than sodium lamp and metal halide lamp (they The life expectancy is about 1,200-15,000 hours). 2. Since the LED street light is a semiconductor material, no filament and other additional materials, it has good shock resistance. 3. The color rendering index of LED street light source lighting can reach 80 or more, which is close to natural light. In this case, the human eye is more likely to distinguish things and is beneficial to driving safety. The color rendering index of high pressure sodium lamps is only 20-30. 4. Conventional gas discharge lamps, such as high-pressure sodium lamps, have a preheating process at startup, which wastes energy and is not conducive to intelligent control. LED streetlights have fundamental differences in light source, and there is no "start-up time" problem. Power-on can work normally immediately, and it is very convenient to realize intelligent energy-saving control. 5. Since the traditional street light source uses the mechanism of mercury vapor to emit light, the disposal of the waste light source is also an urgent problem to be solved all over the world. At the same time, the light-emitting mechanism of the traditional light source determines that it emits ultraviolet rays harmful to the human body. The LED street light source is solid-state lighting. It has no harmful substances such as mercury and does not emit ultraviolet light. Therefore, it is an environmentally friendly light source. 6. In the optical system, the traditional street light source is omnidirectional, half of the light is reflected by the reflector, and the reflector absorbs part of the light, so the light loss is relatively large. Since LED street lights are unidirectional, the utilization of light is higher than that of conventional street lamps. 7. The light distribution curve of traditional street lamps is determined by the reflector, so it has certain limitations, and the LED street light source is a distributed light source, which can make the light source of the lamp be ideal batwing by the design of each electric light source. By reasonably controlling the distribution of light, the pavement spot is rectangular, and a high illumination uniformity is obtained within an effective illumination range. 8. More perfect automatic control (optional): Different brightness can be set according to the needs of different time periods, which can improve the energy saving effect. If it is bright at 7 o'clock in the evening, it is 200W. When there are few people in the middle of the night, the brightness is automatically adjusted to 100W, which can save 60W. In the current TD lighting design, the lamp distance is generally three times the height of the lamp, and the lamp height is generally equivalent to the road width of the road. According to the geometric triangular relationship, the light distribution angle of the lighting fixture should be calculated to be about 140 degrees in the C0/180 direction. In the past 100 years, the illumination source has experienced three important stages: incandescent lamps, fluorescent lamps, high-intensity discharge lamps (HID), and now have broad prospects in the lighting industry. The LED street light source is called the fourth generation light source. As an emerging light source, LED street light has long life, high luminous efficiency, low power consumption, short starting time, high color rendering index, low working temperature, firm structure, no fear of vibration, good directionality, low working voltage, no UV Radiation, light weight and other remarkable features are the world's most promising new generation of light sources. Moreover, the LED street light source can achieve mercury-free production, which is also of great significance to environmental protection. Solid-state lighting lamps using semiconductor LED street lamps as light sources will gradually replace traditional lighting lamps into various applications. At present, lighting consumption accounts for about 20% of the total power consumption, greatly reducing lighting power is an important way to save energy. LED street lights are attracting the attention of the world with their superiority. The United States, Japan and other countries and Taiwan have predicted the LED street lighting efficiency. 55% of the incandescent lamps and fluorescent lamps in the United States have been replaced by LED street lamps, saving 35 billion US dollars in electricity bills per year and reducing 725 million tons of carbon dioxide emissions per year. The replacement of 100% incandescent lamps in Japan into LED street lamps can reduce the power generation of 1-2 nuclear power plants and save more than 1 billion liters of crude oil per year. In Taiwan, 25% of incandescent lamps and 100% fluorescent lamps are replaced by LED street lamps, saving 11 billion kWh per year. LED street lighting will also form a huge industry market of 50 billion US dollars. In recent years, internationally renowned lighting companies such as Philips, Osram, GE, etc. have successively launched LED street lighting semiconductor lighting plans, set up national key laboratories, and invested heavily in research and development.

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