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lumen-hour

American  
[loo-muhn-ouuhr, -ou-er] / ˈlu mənˌaʊər, -ˌaʊ ər /

noun

Optics.

  1. a unit of luminous energy, equal to that emitted in 1 hour by a light source emitting a luminous flux of 1 lumen. lm-hr

Etymology

Origin of lumen-hour

First recorded in 1920–25

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.