spectral distribution [Xλ(λ); (Xλ)]

quotient of the radiant or luminous or photon quantity dX(λ) contained in an elementary range of dλ of wavelength at the wavelength, λ, by that range


Unit: W·nm-1, lm·nm-1, nm-1

Equivalent term: “spectral concentration”

NOTE 1 The term “spectral distribution” is to be preferred to the equivalent term “spectral concentration” when dealing with the function Xλ(λ) over a range of wavelengths, not at a particular wavelength.

NOTE 2 See NOTES to “spectral”.

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