The small light source characteristics of LED chips can easily achieve accurate light distribution and secondary optical optimization design, accurately control the direction of light, fully distribute the light to the required lighting roads, to prevent light pollution and glare. Secondary optics is an important link which directly determines the output efficiency, distribution, uniformity and glare degree of LED street lamp lens. Green urban road lighting requires LED street lamps to produce rectangular spots just covering the road, and to minimize light pollution to other places outside the road, such as residential buildings and buildings.
Most of the high-power white LED spot in the existing market is circular. LED streetlights without secondary optical lighting design, then illuminated on the road spot will be a "round cake", about half of the spot will be scattered outside the road and wasted, and the spot in the middle will be relatively bright, to gradually darken around. When the lamp is installed on the road, there will be a clear distribution of light and dark spots between the lamp, causing visual fatigue to the driver and causing accidents. In this case, LED street lamps can not be called "energy saving" and "green lighting".
LED glass lens on the street lamp application of light distribution technology, reasonable control of light distribution so that the spot is rectangular, to ensure the ideal road brightness and uniformity at the same time, eliminating the glare of ordinary high-power LED street lamp and high-power LED street lamp energy utilization to the extreme, no light pollution. LED glass lens has ultra-high uniformity, if designed for a specific scene can achieve more than 85%. The light distribution curve is optimized according to the actual road conditions. The curve has perfect airfoil shape in C0-C180 direction and self-deflection angle in C90-C270 direction can reach more than 15 degrees. The geometric utilization ratio (the ratio of the required illumination area to the actual illumination area) can be increased to more than 80% within the specified range of use.
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