The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.
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distribution curve, <of luminous intensity>
curve to express values of luminous intensity of a source as a function of direction in space, and normally expressed in polar coordinates (i.e. with the origin at the photometric centre)
Note 1 to entry: This entry was numbered 17-340 in CIE S 017:2011.