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    quantitykind:SphericalIlluminance
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    http://qudt.org/vocab/quantitykind/SphericalIlluminance

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    quantitykind:

    lang:en
    Illuminance
    lang:""
    Spherical illuminance is equal to quotient of the total luminous flux \(\Phi_v\) incident on a small sphere by the cross section area of that sphere.
    lang:""
    http://eilv.cie.co.at/term/1245
    lang:""
    \(E_v,0 = \int_{4\pi sr}{L_v}{d\Omega}\), where \(d\Omega\) is the solid angle of each elementary beam passing through the given point and \(L_v\) is its luminance at that point in the direction of the beam.