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

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    lang:en
    Reflectance Factor
    lang:""
    \(R = \frac{\Phi_n}{\Phi_d}\), where \(\Phi_n\) is the radiant flux or luminous flux reflected in the directions delimited by a given cone and \(\Phi_d\) is the flux reflected in the same directions by an identically radiated diffuser of reflectance equal to 1.
    lang:""
    Reflectance Factor is the measure of the ability of a surface to reflect light or other electromagnetic radiation, equal to the ratio of the reflected flux to the incident flux.