| Definition: | quotient of the spectral distribution, Xλ(λ), of a radiant, luminous or photon quantity, X(λ), and a fixed reference value, R, which can be an average value, a maximum value or an arbitrarily chosen value of this distribution S(λ)=Xλ(λ)R Note 1 to entry: The relative spectral distribution has unit one. Note 2 to entry: This entry was numbered 845-01-18 in IEC 60050-845:1987.
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