Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Uniform Side Illumination Generated from LEDs Arranged by an Annealing Algorithm

  • Wang, Xu (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Lei, Panling (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Qian, Chaoyi (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Wang, Zhiping (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Xu, Xuefen (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Su, Zhouping (School of Science, Jiangnan University)
  • Received : 2022.01.22
  • Accepted : 2022.05.06
  • Published : 2022.06.25
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Abstract

Given a cubic space, it is easy to uniformly illuminate the floor with light sources placed on top. However, little has been reported about uniform illumination on walls with the same configuration of light sources. Here we present a luminaire consisting of nine light-emitting diodes (LEDs) with perfect Lambertian distribution, placed on the top as a 3 × 3 rectangular LED array. The distances between LEDs and tilt angles of each individual LED are adjustable and optimized by an annealing algorithm. After optimization, the array produces a rectangular illumination pattern on one wall with a uniformity of about 89%. Analysis shows that the tilt angles of individual LEDs are key parameters for uniform side illumination. In a scenario that is more practical, the tilt angles of all the LEDs are set to be the same, only decreasing the uniformity to 83%.

Keywords

Acknowledgement

National Natural Science Foundation of China (11905160); The "333" project of Jiangsu Province (BRA2020327); Science Foundation of Wuxi Institute of Technology (ZK201903).

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