CIE scotopic luminous efficiency function

[3.10.3] V’ (λ)

NOTE: This term and its definition were changed in RP-16-17 Addendum 1. Deletions have a strike-through. New text is bold.

Previous name: values of spectral luminous efficiency for scotopic vision

Values at 10-nm intervals (see Table 13.7) were provisionally adopted by the International Commission on Illumination (CIE) in 1951.

Note: These values of spectral luminous efficiency were determined by observation by young dark-adapted observers using extra-foveal vision at near-threshold luminance.

The spectral luminous efficiency function for scotopic vision, adopted by the International Commission on Illumination (CIE) in 1951. (See Table T.7.)

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