lm hr

lm-hr

Optics.
lumen-hour; lumen-hours.
Dictionary.com Unabridged

lumen-hour

[loo-muhn-ouuhr, -ou-er]
noun Optics.
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:
1920–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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