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The city's street lights are to illuminate the road,however,it brings a lot of light pollution and energy waste, it has long been heavily criticized but no good solutions. The media recently reported that a group of researchers from China, Taiwan and Mexico developed a new lighting system, the efficient useful of LED ensure that street lamp illuminates where only need light, without creating unnecessary light. We often see the light and dark areas of the road serrated distribution on the road lighted by ordinary street lighting especially on the narrow road. The traditional way of lighting is not only inefficient, but also result in a serious light pollution. The study found that more than one fifth of the traditional street lights energy are wasted by levels and upward light. "A unique feature of this new LED system is its ability to adapt to different street street layout, efficient lighting for a variety of streets and roads," China Taiwan Central University involved in the study of electro-optical and Engineering Professor Sun Qingcheng said. This new street lighting system consists of three parts. The first part contain a string of light emitting diodes, each of them is equipped with the apparatus called a lens of total internal reflection (TIR), and it can pooled light and precisely control the light beam direction so that the light emitted in parallel without mutual cross. These lens is mounted in a reflector cavity, the recycling of light ensure that they can be used to illuminate a target, which is the second part of the system. The third part is the outermost layer of the light filter means, its role is to reduce unwanted glare. Through this unique structure, the researchers were able to control the shape of the beam, the preliminary design of the beam is rectangular in shape, very suitable for road lighting. The researchers used light utilization (OUF) to quantify the performance of the street lamps, the LED road light utilization efficiency is higher,the light performance is better. The computer simulation results show that this new type of street lighting system light utilization efficiency can reach 51% to 81%, far more than 45% of the ordinary street. In addition, compared with the traditional street lights, this new lamp brightness is higher, more energy efficient, easy to produce glare and light pollution. The researchers said that due to the design of simple structure, the use of ordinary LED bulbs can be easily modular assembly. They prototyping, is expected to be completed within next 3-6 months, the actual installation experiments would be done on the road early next year. More professional user-friendly website www.lead-lighting.com is to create a more perfect LED lights.
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street light, TIR, LED road light, OUF, LED bulbs, street lighting,
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