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  Study on the law of natural light effect on tunnel lighting

  In the tunnel lighting field, reasonable use of natural light, reduce energy consumption of artificial lighting is one of the effective ways to realize green lighting. Combine with the tunnel lighting engineering practice and base on different times and different depths road illumination measured in Yunnan Tengchong Lushan tunnel, drawn the chart of the road illumination and the tunnel depth, natural light, established the mathematical model of pavement illuminance and tunnel depth variation in natural light conditions，expect to get the law of illumination variation in natural light conditions, at last provides the reference for tunnel lighting energy-saving in using natural light.

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