From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. (Photom.) (a) A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere. (b) A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness. [Webster 1913 Suppl.]
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