Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Design of a Reflector for LED Light Sources with Asymmetric Light Distribution

비대칭 배광을 갖는 LED 스포츠 조명 반사경 설계

  • Seo, Jin-Hee (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jo, Ye-Ji (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Lee, Hyun-Hwa (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Seo, Jae-Yeong (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jun, Won-Kyoun (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Lee, Han-Yul (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Kang, Dong-Hwa (Department of Nano-optical Engineering, Korea Polytechnic University) ;
  • Jung, Mee-Suk (Department of Nano-optical Engineering, Korea Polytechnic University)
  • 서진희 (한국산업기술대학교 나노광공학과) ;
  • 조예지 (한국산업기술대학교 나노광공학과) ;
  • 이현화 (한국산업기술대학교 나노광공학과) ;
  • 서재영 (한국산업기술대학교 나노광공학과) ;
  • 전원균 (한국산업기술대학교 나노광공학과) ;
  • 이한율 (한국산업기술대학교 나노광공학과) ;
  • 강동화 (한국산업기술대학교 나노광공학과) ;
  • 정미숙 (한국산업기술대학교 나노광공학과)
  • Received : 2018.11.01
  • Accepted : 2018.11.26
  • Published : 2018.12.25
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Abstract

In this paper, we study a method of designing a reflector for LED light sources with an asymmetric light distribution. In a sports game, lighting with a symmetric distribution makes the athlete and spectators look directly at the light source, so it can cause glare. We derive the optimal tilt angle and design a reflector with asymmetric light distribution to solve these problems. Afterward, performance is analyzed according to the tennis-court lighting standard, and is confirmed to meet the class 1 European standard.

본 논문은 비대칭 배광을 가지는 LED 광원용 반사경 설계 방법에 대한 연구를 진행하였다. 스포츠 경기에서 광원을 중심으로 대칭 배광을 갖는 조명은 선수와 관중이 광원을 직접적으로 바라보게 되어 눈부심을 발생시키는 문제점이 있다. 이러한 문제점을 해결하기 위해 최적 기울기 각도를 도출하여 비대칭 배광을 갖는 반사경 설계를 진행하였다. 이후 테니스장 조명 규격에 맞게 배치하여 성능 분석을 진행하였고 유럽 표준 조명 등급의 Class 1을 만족하는 것을 확인하였다.

Keywords

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Fig. 1. Symmetric sports lighting.

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Fig. 2. Asymmetric sports lighting.

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Fig. 3. XHP50-2 LED of CREE (top, side, view).

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Fig. 4. Reflector shape.

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Fig. 5. Example of LightTools polar 2D.

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Fig. 6. Distribution of light and illuminance in all directions.

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Fig. 7. 3D view of lamp with backlight.

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Fig. 8. Asymmetric angle.

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Fig. 9. Layout of upside reflector.

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Fig. 10. Equation of light distribution and reflector tilt angle.

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Fig. 11. Design of upside reflector using fitted curve.

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Fig. 12. Design of upside reflector.

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Fig. 13. Result of upside reflector.

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Fig. 14. Layout of edge in reflector.

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Fig. 15. Edge in reflector angle.

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Fig. 16. Design of reflector with added edge.

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Fig. 17. Illuminance comparison of each designed reflector.

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Fig. 18. Layout of side reflector.

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Fig. 19. Equation of light distribution and reflector tilt angle.

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Fig. 20. Flat side reflector and curved side reflector.

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Fig. 21. Illuminance comparison of designed side reflectors.

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Fig. 22. Design of final reflector.

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Fig. 23. Result of final reflector.

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Fig. 24. Evaluation area of tennis court.

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Fig. 25. Simulation result of Luminaires placement.

Table 1. Calculation of tilt angle in upside reflector

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Table 2. Calculation of tilt angle in backlight reflector

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Table 3. Calculation of tilt angle in side reflector

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Table 4. European standard indoor tennis light class

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Table 5. Maintenance factor of lighting

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Table 6. Simulation result of Luminaires placement

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