IEVref:845-21-060ID:
Language:enStatus: Standard
Term: illuminance
Synonym1:
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Symbol: Ev
E
Definition: density of incident luminous flux with respect to area at a point on a real or imaginary surface

E v = d Φ v dA

where Φv is luminous flux and A is the area on which the luminous flux is incident

Note 1 to entry: Illuminance can be derived from the spectral irradiance distribution by

E v  =  K m 0 E e,λ (λ)V(λ)dλ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaaa baaaaaaaaapeGaamyramaaBaaaleaacaqG2baabeaakiaacckacqGH 9aqpcaGGGcGaam4samaaBaaaleaacaqGTbaabeaak8aadaWdXbqaai aadweadaWgaaWcbaGaaeyzaiaabYcacqaH7oaBaeqaaaqaaiaaicda aeaacqGHEisPa0Gaey4kIipakiaacIcapeGaeq4UdW2daiaacMcaca aMc8UaamOvaiaacIcacqaH7oaBcaGGPaGaaGPaV=qacaqGKbGaeq4U dWgaaa@542E@

where Km is maximum luminous efficacy, Ee,λ(λ) is the spectral irradiance at wavelength λ and V(λ) is spectral luminous efficiency.

Note 2 to entry: The corresponding radiometric quantity is "irradiance". The corresponding quantity for photons is "photon irradiance".

Note 3 to entry: The illuminance is expressed in lux (lx = lm·m−2).

Note 4 to entry: This entry was numbered 845-01-38 in IEC 60050-845:1987.


Publication date:2020-12
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