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Rectangular illumination using a secondary optics with cylindrical lens for LED street light
Hsi-Chao Chen1, Jun-Yu Lin, Hsuan-Yi Chiu
1Department of Electronic Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan. hcchen@yuntech.edu.tw
Optics Express
|March 14, 2013
Summary
Economical LED street lighting requires a 7:3 rectangular illumination pattern. This study develops an analytical solution using cylindrical lenses and light tracing to achieve precise rectangular light distribution, ensuring over 99% relative illumination with tight positional tolerances.
Area of Science:
- Optics and Photonics
- Illumination Engineering
- Materials Science
Background:
- Efficient street lighting necessitates specific illumination patterns for economic viability.
- Achieving rectangular light distribution from LEDs typically requires advanced optical solutions.
Purpose of the Study:
- To develop an analytical solution for secondary optics to create a 7:3 rectangular illumination pattern for LED street lights.
- To investigate the use of cylindrical lenses for achieving precise rectangular illumination.
Main Methods:
- Utilized light tracing and boundary conditions to derive analytical solutions for lens curvature.
- Employed Normalized Cross Correlation (NCC) to compare experimental and simulation results for single LED and 9-LED modules.
- Analyzed Root Mean Square (RMS) error to quantify accuracy.
Main Results:
- An analytical method was established for designing optics to achieve specific rectangular illumination ratios.
- High correlation (NCC) and low error rates (RMS) were observed between simulations and experiments.
- Positional tolerance within ± 0.2 mm is critical for maintaining over 99% relative illumination.
Conclusions:
- The proposed analytical solution effectively designs secondary optics for rectangular LED street light illumination.
- The method demonstrates high accuracy and reliability for both single and multiple LED configurations.
- Strict positional control is essential for achieving desired illumination uniformity and efficiency.
