Lumen meaning

lo͝omən
The definition of a lumen is the measure of brightness from a light source.

An example of a lumen is the 13 lumens of a candle and the 1,200 lumens of a 100 watt light bulb.

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(anatomy) The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
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(biology) The interior of a membrane-bound compartment or organelle in a cell.
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(physics) The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions.
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(anatomy) The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
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(biology) The interior of a membrane-bound compartment or organelle in a cell.
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(physics) The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions.
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The basic unit used to measure the flow of light in the SI system, equal to the amount of light emitted through a solid angle of one steradian by a light source with the intensity of one candela (0.0015 watt)
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The bore of a hollow needle, catheter, etc.
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(anat.) The passage within a tubular organ.
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(anatomy) The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
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(biology) The interior of a membrane-bound compartment or organelle in a cell.
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(physics) The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions.
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The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine.
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The SI derived unit used to measure the amount of light passing through a given area per second. One lumen is equal to the luminous flux passing per unit solid angle from a light source with a strength of one candela.
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A unit of measurement of the light intensity radiating in the air in all directions from a light source. Lumens define "luminous flux," which is energy within the range of frequencies we perceive as light. For example, a wax candle generates about 13 lumens; a 60-watt bulb approximately 800, and a 100-watt bulb 1,600 lumens.Lumen Ratings for Data ProjectorsWhen choosing a data projector, the lumen rating is an important specification. In a small, dark room, 500 lumens may be ample; however, in a conference room with normal lighting, 1,000 to 2,000 lumens is required. In a large, well-lit room, at least 2,000 lumens is necessary. This rating is derived by taking the average of photometer readings at several points on a full white image on the screen. See lux, ANSI lumen, Lm/W, candela and spectrum.
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(physics) In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
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(anatomy) The cavity or channel within a tube or tubular organ.
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(botany) The cavity bounded by a plant cell wall.
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(medicine) The bore of a tube such as a hollow needle or catheter.
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Origin of lumen

  • Latin lūmen an opening, light leuk- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Latin lūmen an opening, light leuk- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition