| Definition: | function representing the relative spectral effectiveness of optical radiation, for a specified biological effect, in a specified system Note 1 to entry: The normalized action spectrum is the wavelength dependence of the inverse of the dose of monochromatic radiation required to induce a certain (biologic) response; the action spectrum is commonly normalized to a value of 1 at the wavelength of "maximum action", i.e. where the smallest dose suffices to induce the required effect. Note 2 to entry: This entry was numbered 845-06-14 in IEC 60050-845:1987.
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