Meaning of lumen-hour

lu•men-hour

Pronunciation: (l'mun-our", -ou"ur), [key]
— n. 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. Abbr.: lm-hr
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.