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Hollow Light Guide Module Involving Mini Light-Emitting Diodes for Asymmetric Luminous Planar Illuminators

Author

Listed:
  • Zhi Ting Ye

    (Department of Electro-Optical Engineering, National United University, 2, Lienda, Miaoli 26063, Taiwan)

  • Chin Lung Chen

    (Materials and Chemical Engineering, National United University, 2, Lienda, Miaoli 26063, Taiwan)

  • Lung-Chien Chen

    (Department of Electro-Optical Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan)

  • Ching Ho Tien

    (Department of Electro-Optical Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan)

  • Hong Thai Nguyen

    (Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, 168, University Rd., Min-Hsiung, Chia-Yi 62102, Taiwan)

  • Hsiang-Chen Wang

    (Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, 168, University Rd., Min-Hsiung, Chia-Yi 62102, Taiwan)

Abstract

Light-emitting diodes (LEDs) have numerous advantages. However, LEDs only offer a point light source. Therefore, transforming LEDs into planar light sources is a new objective in general lighting applications. Solid light guides have strong uniformity but are marred by their material absorption characteristics and weight. Hollow light guides constitute a solution to the weight problem but exhibit poor uniformity and necessitate sacrificing efficiency to enhance uniformity. To resolve the uniformity, weight, and efficiency problems simultaneously, we propose a hollow light guide architecture involving mini-LEDs with asymmetric luminous intensity. To develop this guide module, we first optimized the aspect ratio of the cavity and then modulated the light path by using varied angles of the reflection surface on the end wall of the module. We then designed a beveled reflection surface near the mini-LEDs to further enhance uniformity. An archetype of the proposed architecture for planar light source modules had a width and depth of 51.5 and 9.95 mm, respectively. Experimental results revealed a total efficiency of 83.9% and uniformity of 92.3%. The module weight was determined to be 215 g, which was 40% lighter than that of similarly sized solid light guide modules.

Suggested Citation

  • Zhi Ting Ye & Chin Lung Chen & Lung-Chien Chen & Ching Ho Tien & Hong Thai Nguyen & Hsiang-Chen Wang, 2019. "Hollow Light Guide Module Involving Mini Light-Emitting Diodes for Asymmetric Luminous Planar Illuminators," Energies, MDPI, vol. 12(14), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2755-:d:249501
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    References listed on IDEAS

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    1. Yu-Sheng Huang & Wei-Cheng Luo & Hsiang-Chen Wang & Shih-Wei Feng & Chie-Tong Kuo & Chia-Mei Lu, 2017. "How Smart LEDs Lighting Benefit Color Temperature and Luminosity Transformation," Energies, MDPI, vol. 10(4), pages 1-13, April.
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    Cited by:

    1. Roman Sikora & Przemysław Markiewicz, 2020. "Assessment of Colorimetric Parameters for HPS Lamp with Electromagnetic Control Gear and Electronic Ballast," Energies, MDPI, vol. 13(11), pages 1-21, June.
    2. Andreas Papalambrou & Lambros T. Doulos, 2019. "Identifying, Examining, and Planning Areas Protected from Light Pollution. The Case Study of Planning the First National Dark Sky Park in Greece," Sustainability, MDPI, vol. 11(21), pages 1-24, October.
    3. Lambros T. Doulos & Ioannis Sioutis & Aris Tsangrassoulis & Laurent Canale & Kostantinos Faidas, 2020. "Revision of Threshold Luminance Levels in Tunnels Aiming to Minimize Energy Consumption at No Cost: Methodology and Case Studies," Energies, MDPI, vol. 13(7), pages 1-23, April.

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