定义了照度矩阵、平均照度矩阵、均差照度矩阵和参照度矩阵，并阐述了照度矩阵来计算照度的方法。
It defines illuminance matrix, average illuminance matrix and deviation illuminance matrix, and a method of computing illuminance based on illuminance matrix is explained.
照明系统中离地1米处的照度设计如下，厂房内灯具高度为10米。(平均)。
Following lighting levels planned at 1m from the ground, the height of the light in factory is 10m. (Average).
表中光照度数据为上午和下午两次观测值的平均值。
The data of solar radiation in the table were the average of forenoon and afternoon.
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