Judd-Vos modified CIE 2-deg photopic luminosity curve (1978)

Data key




  1. Wavelength (nm)
  2. Photopic luminous efficiency, VM(l)


  1. Wavelength (nm)
  2. log Photopic luminous efficiency, VM(l)



  1. Wavelength (nm)
  2. log Photopic luminous efficiency, VM(l)


From Table 1 of Vos (1978). See also Table I(5.5.2) of Wyszecki and Stiles (1982).   

    Vos (1978) made additional corrections to Judd's (1951) revision of the CIE 1931 2 deg CMFs (CIE, 1932) and incorporated the infra-red color reversal described by Brindley (1955).   The function, however, like Judd's, yields a "standard observer" with an artificially high macular pigment density.  The CMF or the Judd-Vos V(l), which is tabulated here, is also known as the modified CIE luminosity function VM(l).


Brindley, G. S. (1955). The colour of light of very long wavelength. Journal of Physiology, 130, 35-44.

CIE. (1932). Commission Internationale de l'Eclairage Proceedings, 1931. Cambridge: Cambridge University Press.

Judd, D. B. (1951). Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight. In Proceedings of the Twelfth Session of the CIE, Stockholm (vol. 1, pp. 11). Paris: Bureau Central de la CIE.

Vos, J. J. (1978). Colorimetric and photometric properties of a 2-deg fundamental observer. Color Research and Application, 3, 125-128.

Wyszecki, G., & Stiles, W. S. (1982). Color Science: concepts and methods, quantitative data and formulae. (2nd ed.). New York: Wiley.

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