Open AccessSide-illuminating LED luminaires with accurate projection in high uniformity and high optical utilization factor for large-area field illumination
Author(s) -
Yu Chih Lo,
Jhih You Cai,
Ming Shiou Tasi,
Zheng Yu Tasi,
Ching Cherng Sun
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.00a365
Subject(s) - optics , tilt (camera) , projection (relational algebra) , bent molecular geometry , lens (geology) , light field , materials science , ray tracing (physics) , led lamp , nonimaging optics , physics , computer science , geometry , mathematics , algorithm , composite material
A novel light luminaire is proposed and experimentally analyzed, which accurately projects light into a large rectangular area to achieve uniform illumination and a high optical utilization factor at the target. Side-illuminating luminaires for large-scale illuminated area are typically set with an elevated tilt angle to enlarge the illuminated area. However, the light pattern is bent thereby reducing the uniformity and optical utilization factor at the target. In this paper, we propose an efficient and useful approach with a rotationally symmetric projection lens that is trimmed to adjust the bending effect and to form a rectangular illumination light pattern on the ground. The design concept is demonstrated and verified. Several potential applications such as highly uniform illumination with fitting shapes for sport courts are analyzed and discussed.