Lighting a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm). The SI unit of illuminance and luminous emittance, being the luminous power per area, is measured in Lux. It is used in photometry as a measure of the intensity, as perceived by the human eye, of light that hits or passes
Intensity measure of a random element formula_3 with formula_4. The intensity measure of formula_1 is defined as for all formula_8. Note the difference in notation between the expectation value of a random element formula_3, denoted by formula_4 and the intensity measure of the random measure formula_1, denoted by formula_12. The intensity measure formula_12 is always s-finite and satisfies for every positive measurable function formula_15 on formula_16. Intensity measure In probability theory, an intensity measure is a measure that is derived from a random measure. The intensity measure is a non-random measure and is defined as the expectation value of the random measure