Abstract
The intensity of glare in low-level lighting is positively correlated with the light output efficiency of lamps. The light intercepting plate to eliminate glare will decrease the light output efficiency of lamps. In this paper, we investigate the road lighting efficiency from the lighting mode and the lamp structure. Through the analysis of the road reflection model, we demonstrate the relationship between the different light-emitting angles of street lamps and the lighting efficiency. Using software to simulate the structure of the lamp, we discuss the influence of the light distribution of the light-emitting surface of the lens, the vertical angle in the structure, the optical surface height of lens and the length of the lamp on the light-emitting efficiency of the lamp. We find that the use of forward lighting on rough roads and the use of reverse lighting on smooth roads can greatly improve the reflection efficiency of the road. The key to improve the light output efficiency of lamps is to reduce the optical surface height of lens. When the optical surface height of lens is 7 mm, the light output efficiency of lamps reaches the limit value of 67%, and the energy consumption of lamps is 88% lower than the national standard of 1 W/m<sup>2</sup>.
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