| quantity involved in the visual observation of a source of light when viewed directly from the distance where its apparent diameter just becomes inappreciable Note 1 to entry: The point brilliance is measured by the illuminance produced by the source on a plane, at the observer's eye, normal to the direction of the source. Note 2 to entry: The point brilliance is expressed in lux (lx = lm·m−2). Note 3 to entry: This entry was numbered 845-01-59 in IEC 60050-845:1987.
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