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

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    lang:en
    Irradiance
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    W-PER-M2
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    http://en.wikipedia.org/wiki/Irradiance
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    \(E = \frac{d\Phi}{dA}\), where \(d\Phi\) is the radiant flux incident on an element of the surface with area \(dA\).
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    Irradiance and Radiant Emittance are radiometry terms for the power per unit area of electromagnetic radiation at a surface. "Irradiance" is used when the electromagnetic radiation is incident on the surface. "Radiant emmitance" (or "radiant exitance") is used when the radiation is emerging from the surface.