Illuminance Illuminance describes the ratio of incident light beam per unit light lit area.
Illuminance is measured in luxes (lx) and shows the amount of light energy of the illuminated surface.
The illuminance equals 1 lx when a 1 lumen light flux falls evenly onto a 1 m² surface.
Low light levels, as well as excessive illuminance, negatively impact the body, decrease attention and reaction speed, and lowers productivity. A luxmeter is used to control local illuminance.
