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illuminance vector
vector quantity equal to the directional illuminance expressed as the maximum difference between the illuminances on opposite sides of an element of surface through the point considered, that vector being normal to and away from the side with the greater illuminance
Note 1 to entry: This entry was numbered 845-09-23 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-553 in CIE S 017:2011.