Experimental Research on Application of the Natural Light to Tunnel Lighting Engineering

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  • Wang Bao-Lin
    Hunan Communications Research Institute; Research and Promotion Center for Energy-Saving and Emission-Reduction Technology of Hunan Transportation
  • Ye Ying
    Hunan Communications Research Institute; Research and Promotion Center for Energy-Saving and Emission-Reduction Technology of Hunan Transportation
  • Yan Bingya
    Hunan Communications Research Institute; Research and Promotion Center for Energy-Saving and Emission-Reduction Technology of Hunan Transportation

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In present paper, the natural light was led into the entrance section of a highway tunnel by the specially designed lighting bands, and the lighting luminance profile was modeled referring to the human visual adaptation curve. As the result, the lighting enhanced at the entrance section was completely canceled. In order to validate the current scheme, lighting effects were evaluated by experimental data. In contrast to the conventional schemes, this scheme presented more advantages: (1) Eliminating the ‘black-hole effect’ of tunnel entrance, which significantly improved the driving safety and amenity. (2) The energy-saving of lighting was very considerable. (3) The scheme was simple, practical, and reasonable in cost. It could be concluded the application of natural light to tunnel lighting engineering had significant popularization value.

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