Lumens
Lumen Lu"men, n.; pl. L. {Lumina}, E. {Lumens}. [L., light, an opening for light.] 1. (Photom.) (a) A unit of illumination, being the amount of illumination of a unit area of spherical surface, due to a light of unit intensity placed at the center of the sphere. (b) A unit of light flux, being the flux through one square meter of surface the illumination of which is uniform and of unit brightness. [Webster 1913 Suppl.]

2. (Biol.) An opening, space, or cavity, esp. a tubular cavity; a vacuole. [Webster 1913 Suppl.]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Lumens — Lumen Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom …   Wikipédia en Français

  • lumens — lu·men || luːmÉ™n n. unit for measuring the rate at which light is transmitted (Optics); cavity, hollow space (Anatomy, Botany) …   English contemporary dictionary

  • Lumens/Watt — (LPW / lpw)   A measure of the efficacy (efficiency) of lamps. It indicates the amount of light (lumens) emitted by the lamp for each unit of electrical power (Watts) used.   U.S. Dept. of Energy, Energy Information Administration s Energy… …   Energy terms

  • Lm/ft2 — lumens per square foot …   Medical dictionary

  • Lm/m2 — lumens per square meter …   Medical dictionary

  • Lm/W — lumens per watt …   Medical dictionary

  • Lpw — lumens per watt …   Medical dictionary

  • lumen — {{hw}}{{lumen}}{{/hw}}s. m. inv. (fis.) Unità di flusso luminoso, corrispondente al flusso emesso da una sorgente puntiforme avente l intensità luminosa di una candela; SIMB. lm …   Enciclopedia di italiano

  • Lm/ft2 — • lumens per square foot …   Dictionary of medical acronyms & abbreviations

  • Lm/m2 — • lumens per square meter …   Dictionary of medical acronyms & abbreviations

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