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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reference direction, <of a floodlight>
direction of the maximum luminous intensity from a floodlight or, where there is no unique maximum, the direction of the origin to which the luminous intensity distribution of a floodlight is referred
Note 1 to entry: This entry was numbered 17-1049 in CIE S 017:2011.