Luminous efficiency functions. The CIE physiologically-relevant functions are provided as ascii csv (comma separated values) files, ascii xml (extensible markup language) files, html tables, which appear in your browser window, or dynamic graphical plots. Select the data format, the data stepsize and the data units and click the "Submit" button. The other luminous efficiency functions are provided in linear and logarithmic energy units and in logarithmic quantal units as ascii csv files, returned as files with the *.csv extension. Click the buttons for the data files or "Plot lin E", "Plot log E" or "Plot log Q" for the corresponding plots. For further details about each data set and references click .
CIE (1924) Photopic V(λ)
CIE Photopic V(λ) modified by Judd (1951)
CIE Photopic V(λ) modified by Judd (1951) and Vos (1978) [also known as CIE VM(λ)]
CIE (1951) Scotopic V'(λ)