Table T.4: Definitive Values of the Special Luminous Efficiency Function for Photopic Vision V(λ)


NOTE: This table’s section number was changed in RP-16-17 Addendum 1.  The previous section number was 13.4.


  • Information in this table was obtained from CIE 18.2 (1983), The Basis of Physical Photometry, 2nd ed.
  • Values of V(λ) are expressed with as many as 13 significant digits. Therefore, the digits are shown in triplets.
  • Σ V(λ) = 106.856917101172.
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