| Definition: | ideal observer having a relative spectral responsivity curve that conforms to the spectral luminous efficiency function for photopic vision, V(λ), or to the function for scotopic vision, V′(λ), and that complies with the summation law implied in the definition of luminous flux Note 1 to entry: See also ISO 23539:2005(E)/CIE S 010/E:2004, Photometry – The CIE System of Physical Photometry. Note 2 to entry: This entry was numbered 845-01-23 in IEC 60050-845:1987.
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