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lumen-hour

[loo-muh n-ouuh r, -ou-er]
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. Abbreviation: lm-hr
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Origin of lumen-hour

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018