Luminosity is a photometrical measure of the denseness of luminous intensiveness in a given direction. It reports the quantity of light that passes across or is emitted from a specific region, and falls inside a given plain angle. The SI unit of measurement for luminosity is candela per square meter (cd/m2). The CGS unit of measurement of luminosity is the stilb, which is equal to one candela per square centimetre (10 kcd/m2).

(Sonrise Lighting)

Light quality is frequently quantified in units of measurement of the Color Rendering Index or CRI. This is a valuate on how fine the light source simulates the light of a black body radiator at the same correlative color temperature, when the light is mirrored of a set of normal color samplings. The indicator is normalised so a perfect black body has the indicant Ra=100 and deflexions from this reasons the index to minify. It has been indicated that the CRI has small correlativity with what people believe "good" lighting, and various substitutions metrics has been suggested.

(Sonrise Lights)