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Illumination can be expressed in
Radians.
Lux.
Lumens.
Candela.
Lux.
Illumination is defined as the luminous flux incident per unit area of a surface. The SI unit for illumination is the Lux (lx), which is equivalent to one lumen per square meter (1┬аlx=1┬аlm/m2).
Illumination is defined as the luminous flux incident per unit area of a surface. The SI unit for illumination is the Lux (lx), which is equivalent to one lumen per square meter (1┬аlx=1┬аlm/m2).
E=A╬жтАЛ тАФ Where E is illumination in Lux, ╬ж is luminous flux in Lumens, and A is area in m2
E=d2Icos(╬╕)тАЛ тАФ Illumination at a point considering the distance d and angle ╬╕
When a source of light emits a total luminous flux (╬ж) in lumens, and this light spreads over a surface area (A) in square meters, the intensity of the light falling on that surface at any point is called illumination (E). The relationship is governed by the inverse square law and the Lambert cosine law depending on the geometry of the source relative to the surface.
Illumination is a measure of light density on a surface.
The lumen is the unit of Luminous Flux, while Lux is the unit of Illumination.
One lux equals one lumen per square meter.
Candela is the unit of Luminous Intensity, which describes light emitted in a specific direction.
Standardized unit for lighting design engineering.
Allows for precise calculation of light levels required for specific tasks.
Architectural and interior lighting design.
Determining safety standards for workplace lighting.
Photography and cinematography light metering.
Lumens (lm) measure total light output from a source.
Candela (cd) is Luminous Intensity (flux per solid angle).
Radians are units of plane angle, not related to light flux.
Lux is specifically the SI derived unit of illuminance.
B is correct тАФ Illumination is defined as the luminous flux incident per unit area and is measured in Lux (1┬аlx=1┬аlm/m2).
Remember: Candela is for the source (intensity), Lumens are for the total power (flux), and Lux is for the surface (illumination).