Beleuchtungsstärken

Beleuchtungsstärke is a physical quantity that describes how much luminous flux falls on a surface. It is a measure of the intensity of light on a given area. The SI unit for illuminance is the lux (lx). One lux is equal to one lumen per square meter (lm/m²). It quantifies the perceived brightness of an illuminated surface.

The illuminance at a point on a surface is determined by the luminous intensity of the light source and the distance from the source to the point. Light sources with higher luminous intensity will produce greater illuminance at a given distance. Furthermore, illuminance decreases with the square of the distance from the light source, following the inverse square law. The angle at which the light strikes the surface also affects illuminance; light incident perpendicularly produces the highest illuminance, while oblique incidence reduces it.

Beleuchtungsstärke is crucial in various fields. In lighting design, it helps determine the appropriate amount of light needed for different tasks and environments, ensuring visual comfort and safety. For example, office workspaces typically require higher illuminance levels than residential living rooms. In photography and cinematography, controlling illuminance is essential for achieving desired exposure and image quality. It is also a factor in scientific research, particularly in studies involving light-sensitive materials or organisms. Measurements of illuminance are typically performed using a lux meter.