Crossword Genius

Light unit (5)

Ross

I believe the answer is:

lumen

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">light unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(lumen is a kind of light unit)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for lumen that I've seen before include "Unit of light flux" , "Unit of luminous flux" .)

I've seen this clue in The New York Times and The Wall Street Journal.
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