n.照明；照度
=illumination.
Illuminance of illuminating radiation is always measured in photometric units. 照明辐射的照度通常是以光度为单位。
The performance of the human eye largely depends on the level of illuminance in the visual field. 在视野中人类的眼睛表现大量地仰赖照明度的水平。
Over a surface, Illuminance averaged over the specified surface. 指定表面上照度的平均值。
Surface on which illuminance is measured or specified. 测量或指定照度的表面。
