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lumen-hour

[loo-muh n-ouuh r, -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.
Abbreviation: lm-hr.
Origin
1920-1925
1920-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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