The illuminance, measured in the units of lux (lx), is the ratio between the luminous flux incident upon an area and the size of that area.
The illuminance, measured in the units of lux (lx), is the ratio between the luminous flux incident upon an area and the size of that area.
The illuminance is a measure for the luminous flux density on a surface. It is defined as the ratio of the luminous flux incident on a surface to the size of that surface. The illuminance is not tied to a real surface, it can be determined anywhere in the room. The illuminance can be derived from the light intensity. Whereby, the illuminance reduces by the square of the distance from the light source (inverse square law).
Horizontal illuminance
Average horizontal illuminance
Illuminance at a point
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