# 17-21-072

luminous exposure

DEPRECATED: light exposure

Hv; H

density of incident luminous energy with respect to area at a point on a real or imaginary surface

where Qv is luminous energy and A is the area on which the luminous energy is incident

Note 1 to entry: The term "light exposure" is no longer used.

Note 2 to entry: Luminous exposure can be derived from the spectral radiant exposure distribution by

where Km is maximum luminous efficacy, He,λ(λ) is the spectral radiant exposure at wavelength λ and V(λ) is spectral luminous efficiency. Integral limits can be confined depending on the spectral responsivity of the detectors used as a sensor.

Note 3 to entry: The corresponding radiometric quantity is "radiant exposure". The corresponding quantity for photons is "photon exposure"

Note 4 to entry: The luminous exposure is expressed in lux second (lx⋅s = lm·s·m−2).

Note 5 to entry: This entry was numbered 845-01-43 in IEC 60050-845:1987.

Note 6 to entry: This entry was numbered 17-736 in CIE S 017:2011.

Publication date: 2020-12