| Definition: | effective irradiance with the spectral irradiance, Eλ, spectrally weighted with the erythema spectral weighting function, ser(λ), normalized to 1 at its maximum Note 1 to entry: This definition is based on the assumption that an action spectrum is adopted for the actinic effect considered, and that its maximum value is 1. Note 2 to entry: It is essential to specify which action spectrum is used, as the unit is the same for any action spectrum. Note 3 to entry: The erythemal irradiance is expressed in watt per square metre (W·m−2).
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