• 1. horizontal illuminance: 水平面照度 | 水平照度
• 2. The total horizontal illuminance: 水平面总照度

• 1.Thus to create a good lighting environment for the traffic squares, we should not only pay attention to the horizontal illuminance, but also vertical illuminance within the space.
  因此塑造良好的交通广场照明环境不能只注重水平照度，还包括垂直方向的光线数量。
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• 2.This paper suggests a zenith luminance converting factor. By means of multiplying outdoor horizontal sky illuminance by this factor, the value of zenith luminance of the sky can be obtained.
  本文建议了一种天顶亮度转换系数，它与室外无遮挡水平面上的天空散射光照度相乘，就能获得该天空类型的天顶亮度值。
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