In order to achieve the best road lighting design, we need to comprehensively consider the function, aesthetics and investment cost of LED street lights. On the premise of road lighting, our layout should be based on the requirements of road brightness and uniformity and LED street light equipment (efficiency, lumen output, optical angle, etc.). This article focuses on sharing the basics of LED street lights and how LED street lights meet the requirements of different lighting projects for you
Street light installation parameters
Street light installation parameters
1. Street lamp installation height
It refers to the vertical distance from the center of the lamp to the road surface. Depending on the road width, the installation height is in the range of 6 to 14 meters. Generally, the greater the installation height, the less glare, the better the uniformity, and the wider the spacing between the poles. However, this also means that we will need luminaires with higher power and lumen output.
Over the past few decades, the height of the pole has gradually increased. The energy efficiency of LED lamps is increased from 50 lm/W to 150 lm/W, which is due to the improvement of lighting efficiency. Increasing the rod height can not only achieve better uniformity, but also be more economical and beautiful. Most light poles are 12 meters or more in height, and multiple lights are installed on high poles for highway interchanges.
2. Street lamp spacing
The distance between the lamppost and the lamppost. To determine the optimal spacing for street lighting installations, we need to consider the position of the poles, the size of the road grid (the distance between adjacent pedestrian crossings), the road topography, and surrounding buildings.
3. Street lamp elevation angle
It indicates the angle between the opening (surface) of the indicator and the horizontal plane. By increasing the elevation angle of the lamp on the pole, the light can be projected farther. However, it also gathered glare, which made pedestrians and drivers uncomfortable. Generally, the elevation angle is controlled within 15°.
4. Cantilever length of luminous body
It refers to the horizontal distance from the edge of the road to the center of the light source. Increasing the length of the cantilever can also increase the brightness of the road surface; however, in this case the brightness of the sidewalk will decrease. This parameter affects the level of illuminance on lanes and sidewalks. If the length of the cantilever of the lamp post is fixed, we will need to use asymmetric optical elements on the street lamp to balance the differences.
