Optimization of freeform LED roadway lighting complying CIE standards

Lien Smeesters; Dries Rosseel; Michael Vervaeke; Hugo Thienpont

doi:10.1117/12.2691620

14 September 2023 Optimization of freeform LED roadway lighting complying CIE standards

Lien Smeesters, Dries Rosseel, Michael Vervaeke, Hugo Thienpont

Proceedings Volume 12798, International Optical Design Conference 2023; 127980F (2023) https://doi.org/10.1117/12.2691620
Event: International Optical Design Conference 2023, 2023, Quebec City, QC, Canada

Abstract

Optimization of road lighting towards more sustainable and efficient sources is of major importance. We therefore pursue developing a LED roadway lighting design methodology, from luminance optimization towards the design of the freeform optics, enabling to optimize the illumination power distribution on the street to minimize the required optical output power and power consumption while still fulfilling the CIE 140 – 2000 standard. First, an artificial source is designed featuring an optimized illumination pattern towards the CIE standards while minimizing the required optical output power. Following, the design and optimization of the freeform optic is tackled, enabling the beam shaping of the LED emission pattern towards the optimized illumination pattern. Successful optimization of the freeform optic was achieved, starting from sequential mode calculations using an ideal point source, followed by an iterative optimization using backward raytracing of the requested illumination pattern and extended source simulations. The optimized freeform illumination lens comprises 2 biconic Zernike surfaces, and outperforms the state-of-the-art with respect to the average luminance, and the overall and longitudinal uniformity of the luminance. As a result, we believe our design methodology offers a promising procedure for efficient road lighting design, while having the potential to contribute to more eco-friendly lighting.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lien Smeesters, Dries Rosseel, Michael Vervaeke, and Hugo Thienpont "Optimization of freeform LED roadway lighting complying CIE standards", Proc. SPIE 12798, International Optical Design Conference 2023, 127980F (14 September 2023); https://doi.org/10.1117/12.2691620

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KEYWORDS

Light sources and illumination

Design and modelling

Roads

Freeform optics

Light emitting diodes

LED lighting

Ray tracing

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