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When not specified, the luminous efficiency function generally refers to the photopic luminous efficiency function. The CIE photopic luminous efficiency function y (λ) or V(λ) is a standard function established by the Commission Internationale de l'Éclairage (CIE) and standardized in collaboration with the ISO, [1] and may be used to convert ...
X 10 Y 10 Z 10 (also written XYZ 10 and analogously for the following) is the XYZ-style color space defined using the CIE 1964 10° observer CMFs. [26] The 3 CMFs are mainly derived from Stiles and Burch's RGB color-matching functions, [ 27 ] which unlike the Wright–Guild functions (and the subsequent Judd–Vos corrections) are "directly ...
There are two luminous efficiency functions in common use. For everyday light levels, the photopic luminosity function best approximates the response of the human eye. For low light levels, the response of the human eye changes, and the scotopic curve applies. The photopic curve is the CIE standard curve used in the CIE 1931 color space.
English: Comparison between CIE 1931 photopic luminosity function and a typical normalized M cone response. Useful for explaining the Y tristimulus value in the CIE 1931 color space article. Date
Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd), an SI base unit.
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English: Photopic luminosity function for the human eye in the infrared after Sliney (1976), based on CIE luminous efficacy function to 770 nm, extrapolated curve of Walraven and Leebeck (1963) based on Goodeve (1936), Pinegin (1945), Griffin, Hubbard and Wald (1947), Lau and Leo (1948), and Lewis (1955); corroborated by Sliney (1976).