ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents. Illuminance Illuminance (also know as luminous emittance or luminous flux per area), is the total luminous flux incident on a surface, per unit area. It is a measure of the intensity of the incident light, wavelength-weighted by the luminosity function to correlate with human brightness perception. Photometry QUDT http://qudt.org/vocab/quantity#Illuminance