Lumen
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Lumen
</dt>
A unit of luminous flux equal
to the luminous flux radiated into a unit solid angle (steradian)
from a point source having a luminous
intensity of 1 candela.
</dd>
An ideal source possessing an intensity of 1 candela in
every direction would radiate a total of 4 pi lumens. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use