title: Rectangular illumination using a secondary optics with cylindrical lens for LED street light.
abstract: The illumination pattern of an LED street light is required to have a rectangular distribution at a divergence-angle ratio of 7:3 for economical illumination. Hence, research supplying a secondary optics with two cylindrical lenses was different from free-form curvature for rectangular illumination. The analytical solution for curvatures with different ratio rectangles solved this detail by light tracing and boundary conditions. Similarities between the experiments and the simulation for a single LED and a 9-LED module were analyzed by Normalized Cross Correlation (NCC), and the error rate was studied by the Root Mean Square (RMS). The tolerance of position must be kept under ± 0.2 mm in the x, y and z directions to ensure that the relative illumination is over 99%.
authors.affiliation: Department of Electronic Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan. hcchen@yuntech.edu.tw
authors.forename: Hsi-Chao
authors.initials: HC
authors.lastname: Chen
authors.forename: Jun-Yu
authors.initials: JY
authors.lastname: Lin
authors.forename: Hsuan-Yi
authors.initials: HY
authors.lastname: Chiu
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008029:Lighting / Q000295:instrumentation*