Enter a clue or pattern or both:
The Clue
Unit of light intensity (5 letter answer)
The Answer
LUMEN
Tags
Notes
The answer LUMEN is rarely seen, appearing only about once every 1000 puzzles.
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Definition
LUMEN as a noun:
1. (lumen, lm) = a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
2. a cavity or passage in a tubular organ; "the lumen of the intestine"