With the acceleration of China's urbanization process and the emphasis on energy conservation and emission reduction, environmentally friendly, energy-efficient and long-life LED street lights have been increasingly praised and applied. Compared with the previous years, the LED light efficiency has been greatly improved, and the price has also dropped, and the acceptance of LED street lamps has been greatly improved. The promotion model has gradually evolved from demonstration promotion to popularization. According to the survey of the High-tech LED Industry Research Institute (GLII), the total output of LED street lamps in China (excluding tunnel lights) reached 680,000 baht in 2011, a year-on-year increase of 58%, of which domestic LED street lamps installed 530,000 baht, an increase of 51% over the same period last year. %. It is estimated that the total output of LED street lamps in China will reach 1.22 million baht in 2012, an increase of 79% year-on-year. The domestic installation volume will reach 850,000 baht, a year-on-year increase of 60%. However, the application of LED street lamps is only in its infancy, and the proportion of all street lamps in the country is only about 5%, and there is still a lot of room for growth.
When it comes to road lighting, most people think of energy saving in the first place, but it is important to emphasize that energy saving is not the purpose of road lighting. The purpose of setting lighting on urban motor vehicle traffic roads is to create for motorists. A good visual environment in order to achieve the effects of ensuring traffic safety, improving transportation efficiency, reducing criminal activities and beautifying the night environment of the city. Lighting is provided on the roads for residential areas mainly used by pedestrians and non-motor vehicles for the purpose of providing pedestrians with Comfortable and safe visual environment. Therefore, when we discuss the energy efficiency of LED road lighting, we must also consider its impact on traffic safety and visual comfort for road users.
This article will combine some application cases at home and abroad to share with you our thoughts on several key issues in LED road lighting applications, such as how to achieve energy saving in LED street lights? Can the reliability and longevity of LED street lamps be widely used for large-scale promotion? How to ensure good visual comfort while emphasizing the overall lighting effect of LED street lights?
1. Energy saving rate of LED street lamps
With the improvement of LED light efficiency, the overall lighting effect of LED street lights has been greatly improved in the past few years. In 2008, the whole lighting effect is 50lm/w, which is quite good, but now it is 90lm/w. There are also many, but there is a common misunderstanding at present: the energy saving rate of LED street lamps can only be achieved by the higher light efficiency. The higher the overall lighting efficiency, the more advanced the technology of the enterprise. In fact, the most important effect on the overall lighting effect is the light efficiency and driving current of the LED device itself. It is not difficult to achieve high luminous efficiency, but it will greatly increase the cost. Some companies neglect the impact on system reliability and visual comfort in order to unilaterally pursue the overall lighting effect. For example, the color temperature of LED street lamps is too high (because the higher the color temperature, the higher the LED light efficiency); or the color of the street lamps is greener (because Generally, the higher the color coordinate of the LED is, the higher the light efficiency is. The way the lens panel acts as a cover is also becoming more and more popular, because it can save the light loss of the extra glass cover, but the potential for long-term exposure of the PC lens. Hidden dangers, everyone avoids talking.
For more information, please review "LED- Technology and Application Engineering" magazine published in March
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