“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.”
“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.
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