The application of LED street lamps with special light shape design in the street lamp industry can offset the light angle of street lamps and improve the utilization of road lighting; according to the rectangular aspect ratio, it can produce a spot with an aspect ratio of 2:1. So that there is no shadow between adjacent light spots, and light is formed on the road. The uniform lighting belt makes it more suitable for the lighting design of traffic roads. It can meet a wide range of illumination without increasing the height of the lamp pole. Improve street lamp lighting efficiency, reduce road lighting power density, and realize energy saving and environmental protection of high-power LED street lamps. Compared with traditional high pressure sodium lamps, road lighting has unparalleled advantages:
1. The light-emitting mechanism is different. As LED street lamp is a semiconductor device, its effective life can reach 50000 hours (that is, the light loss is less than 30% after 50000 hours), which is much higher than sodium lamp and metal halide lamp (its life is about 12000-15000 hours).
2. As the LED street lamp is a semiconductor material, without filament and other additional materials, it has good seismic performance.
3. The color rendering index of LED street lamp can reach more than 80, which is close to natural light. In this case, it is easy for human eyes to distinguish things, which is conducive to driving safety; while the color rendering index of high pressure sodium lamp is only 20-30
4. Traditional gas discharge lamp, such as high pressure sodium lamp, has a preheating process when starting, which wastes energy and is not conducive to intelligent control. Due to the essential difference of light source, LED street lamp does not have the problem of "start-up time". It can work normally immediately after power on. It is very convenient and systematic to realize intelligent energy-saving control.
5. As the traditional street lamp light source uses mercury vapor mechanism, the disposal of waste light source is an urgent problem in the world. At the same time, the luminous mechanism of traditional light source determines that it will produce harmful ultraviolet radiation to human body. LED street lamp light source is solid-state lighting, does not contain mercury and other harmful substances, will not emit ultraviolet radiation, is an environmental protection light source.
6. In the optical system, the traditional street light source is omnidirectional light, half of the light is reflected by the mirror, and the mirror absorbs part of the light, so the light loss is relatively large. Because the LED street lamp is unidirectional light, the utilization rate of light is higher than that of traditional street lamp. Chapter seven. The light distribution curve of traditional street lamp is determined by the reflector, so it has some limitations. The light source of LED street lamp is distributed light source. Through the design of various electric light sources, the light source can become an ideal bat wing shape. By reasonably controlling the distribution of light spot, the road light spot can be rectangular and reach the effective lighting standard. High illumination uniformity is obtained in the surrounding area.
7. Better automatic control (optional) 0X1778 can be set to different brightness according to the needs of different time periods to improve the energy-saving effect. If the brightness is 200W at 7:00 in the evening, and when the number of people is small at 12:00, the brightness can be automatically adjusted to 100W, which can save 60W of electricity. At present, in TD lighting design, the distance between lamps is generally three times higher than the height of the lamps, and the height of the lamps is generally equal to the width of the road. According to the geometric triangle relationship, it can be calculated that the light distribution angle of the lamp in the C0/180 direction is about 140 degrees, and the light distribution angle in the C90/270 direction is about 80 degrees. In the past 100 years, the light source has gone through three important stages. Incandescent lamp 0X1775 fluorescent lamp 0X1775 high-intensity discharge lamp (HID), has broad prospects in the lighting industry, now known as the fourth-generation light source. As a new type of light source, LED street lights have long life, high luminous efficiency, high power consumption, short startup time, short color rendering index, high working temperature, low structure, strong structure, good directionality, high working temperature, and working voltage Low-level characteristics. The working voltage is low, 0X1775 has no ultraviolet radiation, and 0X1775 is light in weight. In addition, LED street light sources can achieve mercury-free production, which is also of great significance to environmental protection. As the light source of solid-state lighting, semiconductor LED street lights will gradually replace traditional lighting and enter various application fields.