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Luminosity functions are used to study the properties of large groups or classes of objects, such as the stars in clusters or the galaxies in the Local Group. Note that the term "function" is slightly misleading, and the luminosity function might better be described as a luminosity distribution. Given a luminosity as input, the luminosity ...
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).
Date/Time Thumbnail Dimensions User Comment; current: 23:55, 17 March 2013: 446 × 271 (21 KB): Fuzzypeg {{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Comparison between CIE 1931 photopic luminosity function and a typical normalized M cone response.
Luminosity Image title Graph of photopic luminosity function (black) including CIE 1931 (solid), Judd-Vos modified (dashed), and Sharpe, Stockman, Jagla and Jagle 2005 (dotted); and scotopic luminosity function, CIE 1951 (green).
Luminosity is an absolute measure of radiated electromagnetic energy per unit time, and is synonymous with the radiant power emitted by a light-emitting object. [1] [2] In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical objects. [3] [4]
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The CIE distributes standard tables with luminosity function values at 5 nm intervals from 380 nm to 780 nm. [cie 1] The standard luminous efficiency function is normalized to a peak value of unity at 555 nm (see luminous coefficient). The value of the constant in front of the integral is usually rounded off to 683 lm/W. The small excess ...
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