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“Light as a True Visual Quantity: Principles of Measurement,” Technical Report prepared by Committee TC 1.4 “Vision.”
570 Nm is recommended as a standard because (a) it is reasonably easy to obtain and (b) it is at this wavelength that spectral luminosity functions obtained by brightness matching and flicker photometry differ the least on an absolute scale. CIE illuminant A is obtained by operating a tungsten lamp at 2854 K. CIE illuminant D65 can be approximated by filtering illuminant A with a Kodak Wratten Filter 78AA.
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