A novel LED un-symmetrical lens for road lighting with super energy saving

Secondary optics design in the past research only considered illuminance uniformity and ignored luminance uniformity and glare issue, which may result in serious security problem for vehicle drivers. A novel un-symmetric freeform LED lens designed for roadway lighting is proposed. Optical performance of un-symmetric lens will be compared with symmetric lens by optical software. The simulation results demonstrate that light intensity distribution curve (LIDC) of LED luminaire becomes un-symmetric and the overall roadway surface luminance uniformity with un-symmetric lens increases to 0.6, the longitudinal road surface luminance uniformity increases to 0.8, and light power density (LPD) drops to 0.7 W/m².