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
Random measure a random measure formula_38, the measure formula_39 satisfying for every positive measurable function formula_41 is called the intensity measure of formula_5. The intensity measure exists for every random measure and is a s-finite measure. For a random measure formula_38, the measure formula_44 satisfying for all positive measurable functions is called the supporting measure of formula_38. The supporting measure exists for all random measures and can be chosen to be finite. For a random measure formula_38, the Laplace transform is defined as for every positive measurable function formula_41. For a random measure formula_5, the integrals and formula_52 for positive formula_2-measurable formula_41