LED (LightEmittingDiode) is a new solid-state light source that is competitive in the 21st century. Compared with traditional light sources, it has the advantages of small size, long life, low energy consumption and flexible control. In road lighting, with the development of white LED technology , the luminous flux of single-chip LEDs continues to increase, and the replacement of traditional light sources for LED streetlights will become a trend. The light intensity distribution of the light source in all directions of the space is the light distribution. LED street light distribution is to make the light as much as possible to the various areas of the road surface to obtain the light distribution that meets the requirements of road lighting. Whether the LED street light distribution design is accurate or not is one of the key factors that can replace the traditional street lamp. Studying the LED street light distribution is of great significance to the future system design research of LED road lighting. 1 LED street light distribution features and requirements 1.1 LED street light distribution shape characteristics In road lighting, if there is no light distribution to the LED street light source, the light pattern on the road surface is a circular spot with a large area, and some of the light is scattered outside the road surface and is not used, as shown in Figure 1(a). Shown. In order to meet the requirements of brightness, illuminance and uniformity of the road surface, and to distribute most of the light on the road surface as much as possible to improve the utilization of the light and reduce unnecessary waste, it is usually necessary to illuminate the LED street light. The light pattern or spot formed by the light output from the street light on the road surface is preferably a rectangle, as shown in Fig. 1(b). Figure 1 LED street light distribution diagram 1.2 Road lighting standard light distribution requirements According to the requirements of "Urban Road Lighting Design Standards", the roads in road lighting are divided into express roads, trunk roads, secondary trunk roads and branch roads. The standard values ​​of LED road lighting light distribution requirements should meet the requirements of Table 1. Table 1 Standards of road lighting The current research on LED street lights mainly focuses on the application of secondary trunk roads and branch roads. The small luminous flux is the main reason why LED street lights cannot be applied to the main road. The application on the trunk road has yet to be researched and developed by LED technology. Table 1 Road lighting standard values A business tablet must have powerful business functions. At present, users use tablet products more for entertainment, and insufficient development of commercial value has become a major factor restricting the development of tablet computers. Many far-sighted terminal manufacturers have set their sights on the business tablet field. Business Tablet,4k Tablet,5G Tablet Jingjiang Gisen Technology Co.,Ltd , https://www.jsgisentec.com　
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