AI Article Synopsis
- The LED street light needs a rectangular illumination pattern with a 7:3 divergence angle for cost-effective lighting.
- Research focused on using two cylindrical lenses instead of free-form curvature to achieve this rectangular distribution.
- Analysis of experimental data compared to simulations of single and multiple LEDs showed a strict positional tolerance of ±0.2 mm in all directions to maintain over 99% relative illumination.
Article 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%.
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| http://dx.doi.org/10.1364/OE.21.003201 | DOI Listing |
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