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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.
set terminal svg font "Bitstream Vera Sans,12" size 600, 400 set output "CIE_1951_scotopic_luminosity_function.svg" set xrange [380: 700] set yrange [0: 1] set xtics axis nomirror set ytics axis nomirror set key off set border 3 plot "scvle_1.txt" using 1: 2 \ with line linetype rgbcolor "blue" linewidth 2
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.
Factor ()Multiple Value Item 0 0 lux 0 lux Absolute darkness 10 −4: 100 microlux 100 microlux: Starlight overcast moonless night sky [1]: 140 microlux: Venus at brightest [1]: 200 microlux
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brightest (luminosity distance of 2.4 billion light-years) +13.42: moon Triton: seen from Earth Maximum brightness [61] +13.65: dwarf planet Pluto: seen from Earth maximum brightness, [66] 725 times fainter than magnitude 6.5 naked eye skies +13.9 moon Titania: seen from Earth Maximum brightness; brightest moon of Uranus +14.1 star WR 102: seen ...
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The luminous flux accounts for the sensitivity of the eye by weighting the power at each wavelength with the luminosity function, which represents the eye's response to different wavelengths. The luminous flux is a weighted sum of the power at all wavelengths in the visible band. Light outside the visible band does not contribute.