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QUDT VOCAB Quantity Kinds Release 2.1.25
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quantitykind:SphericalIlluminance
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http://qudt.org/vocab/quantitykind/SphericalIlluminance
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Illuminance
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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.
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http://eilv.cie.co.at/term/1245
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\(E_v,0 = \int_{4\pi sr}{L_v}{d\Omega}\), 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.