以自由曲面透鏡光學設計應用在板上連接式晶片發光二極體光源作為140W路燈

Optical design of a freeform lens based on multi-chip-on-single-board LED light source for 140W street lamp

In this study, the 140 W LED street lamp with combining a multi-chip-on-single-board (MCOSB) LED light source and a freeform lens was proposed and simulated. In order to prevent two adjacent luminaries from generating strong brightness contrast on the road surface, i.e. the Zebra effect (repeated bright and dark regions). We designed a freeform lens which can provide that the light intensity is good batwing distribution with light intensity about 3000 cd at the middle and 7000 cd at ± 60 deg. This indicates that a uniform and wide illumination area on whole road surface can be achieved. The uniformity values are 0.723, 0.866, and 0.875 for three basic placement of single-sided, zigzag, and opposite, respectively. These results suggest that the lamp installation numbers could be eliminated, and the electrical power consumption could be reduced.