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Definition of lumen from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word ... plural lumens also lu·mi· na
http://www.thefreedictionary.com/lumens
Acronym Finder: Definition of LUMES. What does LUMES stand for?
http://www.thefreedictionary.com/lumens
Definition of a lumens, a measure of light, part of a glossary of lighting terms.
http://encyclopedie.linternaute.com/definition/1011/3/lumens.shtml
It can be defined as the luminous flux emitted into unit solid angle (1 sr) by an isotropic ... Luminous flux in lumens = Radiant power (watts) x 683 lumens/watt x ...
http://encyclopedie.linternaute.com/definition/1011/3/lumens.shtml