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Topic: Lumen (unit)

Related Topics

Luminous efficacy

Luminous efficiency

Luminous flux

Photometry (optics)

Candlepower

Candela

Lux

Luminous intensity

Luminance

Lumen

Intensity

SI derived unit

Luminosity

Steradian

Light

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	Essentials of the SI: Base & derived units
		Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted.
		In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units.
		For a graphical illustration of how the 22 derived units with special names and symbols given in Table 3 are related to the seven SI base units, see relationships among SI units.
	physics.nist.gov /cuu/Units/units.html (468 words)

	Lumen (unit) - Wikipedia, the free encyclopedia
		The lumen (symbol: lm) is the SI unit of luminous flux.
		If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen.
		The lumen can be thought of casually as a measure of the total "amount" of visible light emitted.
	en.wikipedia.org /wiki/Lumen_(unit) (163 words)

	Units: L
		At sea, the lieue was often taken to equal 1/25 degree [2] or 2.4 nautical miles (4445 meters or 2.7619 miles); this unit was gradually replaced by the internationally recognized 3 nautical miles (5556 meters or 3.452 miles).
		the SI unit for measuring the illumination (illuminance) of a surface.
		The intensity of the light source is measured in candelas; the total light flux in transit is measured in lumens (1 lumen = 1 candela·steradian); and the amount of light received per unit of surface area is measured in lux (1 lux = 1 lumen/square meter).
	www.unc.edu /~rowlett/units/dictL.html (4272 words)

	Lumitex Specification 1
		Lumen, lm is the unit of luminous flux.
		Illuminance is the density of the luminous flux on a surface.
		The unit of luminance is candela/in2, in SI units cd/m2) is used.
	www.lumitex.com /spec_1.html (277 words)

	Luminous Flux
		The lumen is the standard unit for the luminous flux of a light source.
		The luminous flux is the part of the power which is perceived as light by the human eye, and the figure 683 lumens/watt is based upon the sensitivity of the eye at 555 nm, the peak efficiency of the photopic (daylight) vision curve.
		The lumen is the unit of luminous flux, and is defined in terms of the candela, an SI base unit like the meter or second.
	hyperphysics.phy-astr.gsu.edu /hbase/vision/lumpow.html (773 words)

	Lumen (unit) - Psychology Wiki
		The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light.
		Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
		ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry.
	psychology.wikia.com /wiki/Lumen_(unit) (392 words)

	Candela
		All the units for measuring and defining light are based on the candela, which is the unit defining the luminous intensity from a small source, in a particular direction.
		Historically, the engineers' unit of power, the watt, has been separated from the unit of luminous intensity, which is also a form of power, because the eye has a varying sensitivity over the visual spectrum, being relatively insensitive to blue and to red light.
		The lumen flux from a practical light source is the sum of the energy in each wavelength band, multiplied by the luminous efficiency of that wavelength.
	www.electro-optical.com /whitepapers/candela.htm (1466 words)

	Lumen - Wikipedia, the free encyclopedia
		Lumen (unit), the SI unit of luminous flux
		Lumen (anatomy), the cavity or channel within a tubular structure
		Thylakoid lumen, the inner membrane space of the chloroplast
	en.wikipedia.org /wiki/Lumen (109 words)

	Self-expanding endovascular stent with silicone coating - Patent 5330500
		said unit structures formed into a closed zig-zag configuration including an endless series of straight sections and joined by bends, and arranged face to face into a shape of multistage; connecting members, which connects said unit structures one another and a mesh, which is wrapped around an outside of said frame.
		The unit structure 11 is constructed of a wire, and the wire is preferably made of stainless steel.
		And the length of connecting members 36, 38 in the ends of the upper and lower portions of the frame 20 is a half of the length of the connecting members 31, 39 of the first embodiment of this invention.
	www.freepatentsonline.com /5330500.html (2750 words)

	Physics Tutoring: Electromagnetic Waves (Site not responding. Last check: )
		Abbreviation L. lumen: a unit of luminous flux equal to the light emitted in a unit solid angle (1 steradian) by a uniform point source of one candela intensity.
		lux: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candela intensity or equal to one lumen per square meter.
		phot: A unit of illuminance equal to the illumination of a surface, 1 square centimeter in area, on which there is a luminous flux of 1 lumen, or the illumination on a surface all points of which are at a distance of 1 centimeter from a uniform point source of 1 candela.
	www.slcc.edu /schools/hum_sci/physics/tutor/2220/em_waves (1034 words)

	Lm (Site not responding. Last check: )
		It is the amount of light that falls on a unit spherical area at unit distance from a source of one candela.
		In steradians this is equivalent to the amount of light that falls on a unit solid angle from a light source of one candela.
		Alternatively, one lumen is the total light produced by an isotropic light source of (1/4π) candelas.
	www.tuxedo-shop.com /search.php?title=Lm (115 words)

	[No title]
		One lumen per square foot is one foot-candle.
		Lux: unit of illuminance, lumens per square metre; in imperial units, one footcandle is approximately 10 lux
		The performance of luminescent signs and markings, which is a property of the materials from which they are fabricated, is measured in the (metric) units of millicandela per square meter.
	www.evacmap.com /Glossary.html (409 words)

	definitions ;photometry
		One definition says that the amount of light emitted by a source of luminous intensity 1 cd and passing through a unit solid angle is 1 lumen and hence a source of 1 cd luminous intensity emits luminous flux of 4pi lm.
		Lumen is an other unit, which corresponds to a certain number of watts depending on wavelenght.
		Intensity is a characteristic of a source: a source which emits a certain flux in unit solid angle is said to have a certain intensity.
	www.physicsforums.com /showthread.php?p=924946#post924946 (769 words)

	lumen - a Whatis.com definition
		The lumen (symbolized lm) is the International Unit of luminous flux.
		One lumen is the amount of light emitted in a solid angle of 1 sr, from a source that radiates to an equal extent in all directions, and whose intensity is 1 cd.
		A steradian is the standard unit solid angle in three dimensions; a sphere encloses 4 pi (approximately 12.57) steradians.
	searchsmb.techtarget.com /gDefinition/0,,sid44_gci541730,00.html (238 words)

	lumen - Search Results - MSN Encarta
		Lumen, unit of luminous flux, the visible energy emitted into a given solid angle by a light source per unit time.
		Lumen Gentium: issuance at the Second Vatican Council
		The council issued 16 documents, notably the constitutions on divine revelation (Dei Verbum, November 18, 1965) and on the church (Lumen Gentium,...
	ca.encarta.msn.com /lumen.html (81 words)

	Lumen - Biocrawler (Site not responding. Last check: )
		In anatomy, the lumen is the cavity or channel within a tube or tubular structure, such as the vascular lumen of a blood vessel, along which blood flows.
		In astronomy, 141 Lumen is the name of an asteroid discovered by the French astronomer Paul Henry in 1875.
		You can find it there under the keyword Lumen (http://en.wikipedia.org/wiki/Lumen)The list of previous authors is available here: version history (http://en.wikipedia.org/w/index.php?title=Lumenandaction=history).
	www.biocrawler.com /encyclopedia/Lumen (216 words)

	[No title] (Site not responding. Last check: )
		To establish a unit of emitted light on a surface 1 foot-candle was introduced.
		Lambert (L) - a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter.
		Lumen (lm) — the unit of luminous flux equal to the amount of light given out through a solid angle of 1 square foot by a point source of 1 candlepower intensity radiating uniformly in all directions.
	www.trainsetelectronics.com /LightUM.htm (517 words)

	The lumen and the lux
		The lumen value contains no information about whether the light flux is dominated by energy in the luminously inefficient, but photochemically efficient, blue wavelength or, as with a tungsten lamp, is largely provided by luminously inefficient but photochemically relatively harmless radiation at the red end of the spectrum.
		The lux is therefore a rather vague unit, considering its central significance in controlling the museum environment.
		For this activity the candela, lumen and lux, with the luminous efficiency curve lurking in the background, form a useful quantitative toolkit.
	www.natmus.dk /cons/tp/lightcd/lumen.htm (890 words)

	20 XGA Projectors - ANSI Lumen Ratings
		The light output of a projector is usually quoted in ANSI lumens; the higher the ANSI lumen rating, the brighter the projector.
		When two projectors, one rated at 600 lumens and the other rated at 700, are projected side-by-side, it is difficult to see a difference in brightness.
		Comparing a 600 lumen unit to an 800 lumen unit, there may be a small difference in apparent luminosity, but most viewers would not consider it to be a difference worth paying a premium for.
	www.projectorcentral.com /cc_20_xgas_1.htm (394 words)

	Conversion of Units
		Alternatively, the unit may be selected from the selector box.
		"mol" denotes the SI unit, whereas "mole" (or "Mol") is numerically equal to Avogadro's number ("NA").
		Basic units are separated by "-" or spaces, division is indicated by "/", powers by suffixed positive integers.
	www.chemie.fu-berlin.de /chemistry/general/units_en.html (205 words)

	FanFiction.Net : Dictionary & Thesaurus (Site not responding. Last check: )
		7 definitions found From The Collaborative International Dictionary of English v.0.48 : Lumen \Lu"men\, n.; pl. L.
		(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.
	www.fanfiction.net /dictionary.php?word=lumen (95 words)

	Unit Conversion - Online Unit Converter
		UnitConversion.org is the ultimate resource for unit conversion.
		Use our free online unit converters to easily convert between different units of measurement.
		Please spread the word about this completely free resource by linking to us.
	www.unitconversion.org (987 words)

	Critical Care \| Full text \| Dialysis with perfusion lumen catheter in intensive care unit
		To evaluate dialysis with or without perfusion lumen catheter-related infections, and to compare with central venous catheter in an intensive care unit.
		Catheters inserted and extracted at least 2 days after, in the intensive care unit, are cultured using the quantitative tip cultures technique described by Brun-Buisson.
		There is no increase of the infectious risk due to the use of catheters associating perfusion lumen and dialysis lumen in the ICU patient.
	ccforum.com /content/6/S1/P96 (372 words)

	fUSION Anomaly. Lumen
		time, especially the flux of visible light expressed in lumens.
		One lumen equals the flux emitted in a unit solid angle, or steradian, by a point source with a uniform intensity of one candela.
		The total luminous flux of a light source divided by 4p equals the average candlepower of the source measured in all directions.
	fusionanomaly.net /lumen.html (175 words)

	lumen Comparison Table (Site not responding. Last check: )
		Next named derived SI unit: lux Up: named derived SI unit Previous named derived SI unit: katal
		defined in terms of the seven SI base units via a system of quantity equations
		defined in terms of derived SI unit via a system of quantity equations
	www.site.uottawa.ca:4321 /astronomy/lumen_table.html (82 words)

	Unit Conversion - Luminance Converter
		Select the unit to convert from in the input units list.
		Select the unit to convert to in the output units list.
		The line containing the selected unit will also become highlighted.
	www.unitconversion.org /unit_converter/luminance.html (108 words)

	Luminance Unit Conversion - Asknumbers.com
		Convert from any light luminance unit to any other light luminance unit.
		Enter a valid numerical luminance value in to the field below and just choose from the lists what luminance units you want to make conversion between.
		If you want to see the All Metric Equivalent of luminance units then simply click on the "All" Button.
	www.asknumbers.com /LuminanceConversion.aspx (57 words)

	ProjectorCentral News - Jun 15 2000 - New NEC 3000 Lumen Installation Unit
		The new projector rounds-out NEC Technologies' diverse projector line-up, solidifying the company's ability to offer the widest range of customized, application-focused projection solutions.
		The MultiSync GT1150 LCD-based projector provides enhanced brightness of up to 3000 ANSI lumens and allows for freestanding double stackability, which increases brightness to up to 6000 ANSI lumens.
		At less than 20 pounds, the new projector is a flexible and economical alternative for rental and staging applications requiring high light output in a small projector package that is simple to set-up, move and manage.
	www.projectorcentral.com /news_story_190.htm (715 words)

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