lumen-hour

 [loo-muhn-ouuhr, -ou-er]  

lu·men-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. 2012.
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Lumen-hour is always a great word to know.
So is zedonk. Does it mean:
a gadget; dingus; thingumbob.
the offspring of a zebra and a donkey.
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