P.71: High-Efficiency and High-Uniformity Modularized Street Lamp Light Engine of a Single LED Source

LED street lamps have advantages of energy-efficient and low maintenance or long lifetime. Furthermore, single-LED street light systems have the advantages of easy assembly and modularized optics over LED-array ones, but of less degree of design freedom. Thus, only if the heat dissipation and optical constraint are solved, a single-LED street light can be realized. In this study, the uniformity (max. to min. ratio) of 3.9 was achieved under a 6-meter-high illumination and an 18-by-18 m2 area, which was lower/better than that of the LED-array ones of 7. Besides, the freeform lens efficiency of the single-LED optics was as high as 85%.