˜yÐÄvlog

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lumen-hour

[ loo-muhn-ouuhr, -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. : lm-hr
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˜yÐÄvlog History and Origins

Origin of lumen-hour1

First recorded in 1920–25

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