Thus to create a good lighting environment for the traffic squares, we should not only pay attention to the horizontalilluminance, 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。
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.