IEVref:845-01-17ID:
Language:enStatus: Obsolete
Term: spectral concentration
Synonym1: spectral distribution, <of a radiant, luminous or photon quantity <i>X</i> (<i>λ</i>)>
[Preferred]
Synonym2:
Synonym3:
Symbol: Xλ
Definition: quotient of the radiant or luminous or photon quantity dX (λ) contained in an elementary range dλ of wavelength at the wavelength λ, by that range

X λ = dX(λ) dλ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadIfadaWgaaWcbaGaeq4UdWgabeaakiabg2da9maalaaabaGaaeizaiaadIfacaGGOaGaeq4UdWMaaiykaaqaaiaabsgacqaH7oaBaaaaaa@4097@

unit: [X] ⋅ m−1, e.g. W ⋅ m−1, lm ⋅ m−1, etc.

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

NOTE 2 – See the note to 845-01-16.


Publication date:1987
Source
Replaces:
Internal notes:2015-08-28: Tagging of &nbsp;&sdot;&nbsp; and &minus; corrected. JGO
2017-06-02: Cleanup - Remove Attached Image 845-01-17.gif
2017-07-11: () in specific use replaced by <>. JGO
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