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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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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