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SI derived unit of visible light emission
The lumen (symbol: lm) is the SI unit of luminous flux, which quantifies the perceived power of visible light emitted by a source. Luminous flux differs
Lumen_(unit)
Topics referred to by the same term
Look up lumen in Wiktionary, the free dictionary. Lumen may refer to: Lumen (unit), the SI unit of luminous flux Lumen (anatomy), the cavity or channel
Lumen
SI derived unit of illuminance
(symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per square metre
Lux
SI unit of luminous energy
photometry, the lumen second (lm⋅s) is the unit of luminous energy in the International System of Units (SI). It is based on the lumen, the SI unit of luminous
Lumen_second
SI unit of luminous intensity
source emits 4π lumens (approximately 12.566 lumens). For the purpose of measuring illumination, the candela is not a practical unit, as it only applies
Candela
Measure of illuminance
Illuminance = luminous intensity × solid angle / length2 Illuminance Lumen (unit) Lux Photometry (optics) Light Parry Moon. "System of photometer concepts"
Phot
American telecommunications company
Lumen Technologies, Inc. (formerly CenturyLink, Inc.) is an American telecommunications company headquartered in Monroe, Louisiana. It offers network
Lumen_Technologies
Unit of illuminance
sometimes ft-c) is a non-SI unit of illuminance or light intensity. The foot-candle is defined as one lumen per square foot. This unit is commonly used in lighting
Foot-candle
Photometric measure
Lightness (color) Luma, the representation of luminance in a video monitor Lumen (unit) Radiance, radiometric quantity analogous to luminance Brightness, the
Luminance
projector’s ability to reproduce color. Color Light Output is specified in the lumen unit and measures a color projection system's ability to correctly reproduce
Color_Light_Output
Observation of LED production efficiency
light-emitting diodes (LEDs). It claims that every decade, the cost per lumen (unit of useful light emitted) falls by a factor of 10, and the amount of light
Haitz's_law
Measurement of visible light
few lumens (because most of the energy is in the infrared, leaving only a dim red glow in the visible). Watts are units of radiant flux while lumens are
Photometry_(optics)
Unit of measurement
distances and the inverse square law. Candela Lumen (unit) Rowlett, Russ (2001-07-13). "How Many? A Dictionary of Units of Measurement". University of North Carolina
Candlepower
CGS unit of luminance
Optical Society of America, volume 32, number 6 (June 1942). – Page 355: "The lumen was proposed by Blondel in 1894 and is now universally accepted. The names
Stilb_(unit)
Class of units of measurement
a unit of luminance equal to 104/π cd⋅m−2. The lumerg is a unit of luminous energy equal to 10−7 lumen-seconds (100 nlm s). The talbot (T) is a unit of
List_of_metric_units
Modern form of the metric system
The International System of Units, internationally known by the abbreviation SI (from its official French name, Système international d'unités), is the
International_System_of_Units
Placement of a tube into the trachea
openings. They incorporate an endotracheal lumen which terminates in the trachea and an endobronchial lumen, the distal tip of which is positioned 1–2 cm
Tracheal_intubation
Room for growing plants under controlled conditions
terms of Lumen (unit)s of light output per unit of power input, but are not yet as widely used. Continuing improvements in lifetime cost per lumen, long
Growroom
Topics referred to by the same term
maintenance, a type of Aircraft maintenance checks Listeria monocytogenes Lumen (unit), a unit of luminous flux 24 Hours of Le Mans race, and related car models
LM
Residential building in Queens, New York
Lumen is a residential skyscraper located at 23-15 44th Road in the Long Island City neighborhood of Queens, New York City. At 731 feet (223 m) tall,
Lumen_(building)
SI unit of magnetic field strength
tesla (symbol: T) is the unit of magnetic flux density (B) (also called magnetic B-field) in the International System of Units (SI). One tesla is equal
Tesla_(unit)
Visible light per unit solid angle
intensity is the perceived power per unit solid angle. If a lamp has a 1 lumen bulb and the optics of the lamp are set up to focus the light evenly into
Luminous_intensity
Perceived luminous power
human eye to different wavelengths of light. The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced
Luminous_flux
Tube for one-sided lung ventilation
A double-lumen endotracheal tube (also called double-lumen endobronchial tube or DLT) is a type of endotracheal tube which is used in tracheal intubation
Double-lumen endobronchial tube
Double-lumen_endobronchial_tube
Skyscraper in Cleveland, Ohio
The Lumen is a high-rise apartment building in the Playhouse Square district of downtown Cleveland, Ohio. Completed in 2020, the 34-story, 396-foot (121 m)
The_Lumen
SI derived unit of luminance
square meter) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity
Candela_per_square_metre
French engineer and physicist (1863–1938)
Bibcode:1942JOSA...32..348M. doi:10.1364/JOSA.32.000348. The unit is pi times the lumens per square meter per steradian. Such a name is impossibly cumbersome
André_Blondel
Non-SI metric unit of luminance
non-SI metric unit of luminance named for Johann Heinrich Lambert (1728–1777), a Swiss mathematician, physicist and astronomer. A related unit of luminance
Lambert_(unit)
Luminous flux incident on a surface per area
equivalently in lumens per square metre (lm·m−2). Luminous exitance is measured in lm·m−2 only, not lux. In the CGS system, the unit of illuminance is
Illuminance
Perception of light level
coming from a source while luminance is the amount of light per unit solid angle per unit of area on the source's surface. The table below shows the standard
Brightness
Unit of luminance
Bibcode:1942JOSA...32..348M. doi:10.1364/JOSA.32.000348. The unit is pi times the lumens per square meter per steradian. Such a name is impossibly cumbersome
Apostilb
Measurement unit derived from basic metric value
SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed
SI_derived_unit
SI base unit of electric current
of the ampere, notably the hertz, joule, watt, candela, lumen, and lux. Like other SI units, the ampere can be modified by adding a prefix that multiplies
Ampere
Medical device
catheters usually have two separated channels, or lumina (or lumen), running down their length. One lumen, with opening at each ends, drains urine into a collection
Foley_catheter
Amount of light captured by a camera
In photography, exposure is the amount of light per unit area reaching a frame of photographic film or the surface of an electronic image sensor. It is
Exposure_(photography)
Deprecated unit of luminance
Skot (symbol: sk) is an old and deprecated measurement unit of luminance, used for self-luminous objects (dark luminance). The term comes from Greek skotos
Skot_(unit)
How efficiently a source produces visible light
the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either
Luminous_efficacy
Unit of measurement for luminance
footlambert (fL, sometimes fl or ft-L) is a unit of luminance in United States customary units and some other unit systems. A foot-lambert equals 1/π or 0
Foot-lambert
Decimal-based systems of measurement
units from early in the 20th century. It also includes numerous coherent derived units for common quantities like power (watt) and irradience (lumen)
Metric_system
American football team season
text. Week 1: San Francisco 49ers at Seattle Seahawks – Game summary at Lumen Field, Seattle, Washington Date: September 7 Game time: 1:05 p.m. PDT Game
2025_Seattle_Seahawks_season
American company
company was founded in January 2024 in El Segundo, California under the name Lumen Orbit by Philip Johnston (ex-McKinsey & Company), Adi Oltean (ex-SpaceX
Starcloud
Perceived light energy
regardless of the amount of radiant energy present. The SI unit of luminous energy is the lumen second, which is unofficially known as the "talbot" in honor
Luminous_energy
Units that are not part of a coherent system
lowercase w as a unit symbol, as opposed to capital W for the actual wattage). 1 watt incandescent replacement corresponds to 15 lumens. Thus, a 72-watt
List of non-coherent units of measurement
List_of_non-coherent_units_of_measurement
Endocrine gland in the neck
cells (thyrocytes), and occasional parafollicular cells that surround a lumen containing colloid. The thyroid gland secretes three hormones: the two thyroid
Thyroid
CGS unit of energy and mechanical work
Foe (unit), relative measure for energy released by a supernova Lumen second, for the lumerg and lumberg units Metre–tonne–second system of units Goodell
Erg_(unit)
Non-SI unit of luminance
The bril is an old, non-SI, unit of luminance. The SI unit of luminance is the candela per square metre. 1 bril is the equivalent of 10−7 ⁄ π ≈ 3.183×10−8
Bril_(unit)
Lossy data compression Loudspeaker Low-pass filter LTI system theory Lumen (unit) Lumped parameters Lyapunov stability Lynch motor Macroscopic Machine
Index of electrical engineering articles
Index_of_electrical_engineering_articles
different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. Conversions between units in the metric
List_of_conversion_factors
Type of system of units of measurement
of its derived units. A coherent derived unit is a derived unit that, for a given system of quantities and a chosen set of base units, is a product of
Coherence (units of measurement)
Coherence_(units_of_measurement)
Definition of the units kg, A, K and mol
exactly 683 lumens per watt (lm⋅W−1). The seven SI defining constants above, expressed in terms of derived units (joule, coulomb, hertz, lumen, and watt)
2019_revision_of_the_SI
Tubular device placed in a vein to administer medicines
in length, made of silicone or polyurethane, and have single or multiple lumens for infusion. The following are the major indications for the use of central
Central_venous_catheter
Pinguelli Rosa Luke's variational principle Luke Chia-Liu Yuan LULI2000 Lumen (unit) Luminance Luminescence Luminiferous aether Luminophore Luminosity distance
Index_of_physics_articles_(L)
List of characters in the Dexter franchise
Julia Stiles Lumen Pierce is first seen after witnessing Dexter kill Boyd Fowler, a serial killer who had been keeping her captive. Despite Lumen being a witness
List_of_Dexter_characters
Inflammatory disease involving a buildup of lesions in the walls of arteries
lining then thickens, increasing the separation between the plaque and the lumen. The thickening somewhat offsets the narrowing caused by the plaque's growth
Atherosclerosis
System of codes for unambiguously representing measurement units
The Unified Code for Units of Measure (UCUM) is a system of codes for unambiguously representing measurement units. Its primary purpose is machine-to-machine
Unified Code for Units of Measure
Unified_Code_for_Units_of_Measure
Israeli entrepreneur and software developer
Ronald Cohen and others, Abrahami was an early investor in health startup Lumen Abrahami was a seed investor in Unlimited Robotics, alongside Micha Kauffman
Avishai_Abrahami
Discretionary Leisure Facilities Chanhassen, Minnesota view 0001869198 LUMN Lumen Technologies Communication Services Alternative Carriers Monroe, Louisiana
List_of_S&P_600_companies
This list of international units is subsidiary to the list of units article and lists widely used modern units in a form of sortable table. Within the
List_of_international_units
Primary frequency standard
359720966701071721258310212×106/6.62607015 h ΔtCs/e2 From 1967 to 1979 the SI optical units, lumen, lux, and candela are defined using the incandescent glow of platinum
Caesium_standard
Lymphatic vessels' part between two valves
larger than the lymph capillaries that have thicker walls, valves in their lumen and smooth muscles in their walls, thus lymph vessel lymphangion is muscular
Lymphangion
Topics referred to by the same term
station, England; National Rail station code LPW. Lumen per watt (better expressed in standard unit symbols as lm/W) This disambiguation page lists articles
LPW
1982 US government action ending telephone monopoly
assets of Lumen Technologies. This encompasses many former US West areas and select non-Bell lines. This acquisition does not include Lumen's mass-market
Breakup_of_the_Bell_System
NFL team in Seattle, Washington
Football Conference (NFC) West division. They have played their home games at Lumen Field in Seattle's SoDo neighborhood since 2002. The only NFL team in the
Seattle_Seahawks
2025 video game
engine's Nanite and Lumen features allowed for higher-fidelity assets and more-realistic lighting, respectively. The adoption of Lumen necessitated reworking
Clair_Obscur:_Expedition_33
Portable hand-held electric light
2001. White LEDs in 5 mm diameter packages produce only a few lumens each; many units may be grouped together to provide additional light. Higher-power
Flashlight
City in Washington, United States
Kingdome until it was imploded in 2000 and moved into Qwest Field (now Lumen Field) at the same site in 2002. The Seahawks lost Super Bowl XL in 2005
Seattle
Chemical compound
intracellular production of carbonic acid (H2CO3) exits the apical (urinary lumen) portion of the cell by Na+ antiport, acidifying the urine. There, it may
Acetazolamide
American private equity company
Miriam (August 3, 2021). "Lumen to sell much of its U.S. telecom assets to Apollo for $7.5 billion". MarketWatch. "Lumen to sell local incumbent carrier
Apollo_Global_Management
Semiconductor light source
theoretical maximum for green LEDs is 683 lumens per watt, but as of 2010 few green LEDs exceed even 100 lumens per watt.[needs update] The blue and red
Light-emitting_diode
Device producing a burst of artificial light
or a twin-lens reflex camera. Its peak light output was around a million lumens. Other flashbulbs in common use were the M-series, M-2, M-3 etc., which
Flash_(photography)
measurement; it has a value and units. The International System of Quantities, which underlies the International System of Units, defines seven base quantities;
List_of_physical_quantities
2014 video game
Gunvolt assigned on a mission to assassinate an adept named Lumen. He is told that Lumen has the ability to resonate with and control any adepts through
Azure_Striker_Gunvolt
Hedgehog. Voiced by Jaleel White; singing voice by Sam Vincent. Prince Lumen Spider Riders The prince of Arachna and the leader of the Spider Riders;
List_of_fictional_princes
American multinational technology company
Sonos, Google Home, and Amazon Echo. Also in 2017, Apple formed a video unit to produce original television series and films, later marketed as Apple
Apple_Inc.
Mayor of Seattle since 2026
installing, but not turning on, the cameras in the Stadium district around Lumen Field and T-Mobile Park. This expansion will remain paused until an independent
Katie_Wilson
Accumulation of degenerative material in the inner layer of artery walls
material forms a swelling in the artery wall, which may intrude into the lumen of the artery, narrowing it and restricting blood flow. Atheroma is the
Atheroma
Microscopic structural and functional unit of the kidney
capsule and tubule are connected and are composed of epithelial cells with a lumen. A healthy adult has 1 to 1.5 million nephrons in each kidney. Blood is
Nephron
Abrahamic monotheistic religion
Encyclopædia Britannica. 2007. Retrieved 31 December 2007. Second Vatican Council, Lumen Gentium Archived 6 September 2014 at the Wayback Machine. Duffy. Saints
Christianity
US Army medical training course
trained or permitted to perform (among other things) laryngoscopy, single lumen tracheal intubation or any kind of surgery (such as emergency cricothyrotomy)
Combat_lifesaver_course
Deliberate use of light to achieve practical or aesthetic effects
light emitted from a source or the luminous flux is measured in lumen (lm). The SI unit of illuminance and luminous emittance, being the luminous power
Lighting
Brand of video projector
the units in modern 35mm film projectors, and produced 250 lumens at a 75:1 contrast ratio. The later 3LV model produced as much as 3500 lumens at a
Talaria_projector
Specialized data centers designed for artificial intelligence
(Google, Meta, Microsoft), telecommunications companies (Cisco, Corning Inc., Lumen Technologies), data center providers (Digital Realty, QTS), energy companies
AI_data_center
Christian church based in Rome
ignorance in itself is not a means of salvation. The Vatican II document Lumen gentium further clarifies the possibility of salvation of those who "through
Catholic_Church
Service https://epqs.nationalmap.gov/v1/json?x=-115.183889&y=36.090556&units=Feet&wkid=4326&includeDate=False. Retrieved 2 November 2025. {{cite web}}:
List of longest NFL field goals
List_of_longest_NFL_field_goals
88th season in franchise history
berth. Week 16: Los Angeles Rams at Seattle Seahawks – Game summary at Lumen Field, Seattle, Washington Date: December 18 Game time: 5:15 p.m. PST Game
2025_Los_Angeles_Rams_season
Temporary surgical incision to create an airway into the trachea
tracheostomy. A tracheostomy tube may be single or dual lumen, and also cuffed or uncuffed. A dual lumen tracheostomy tube consists of an outer cannula or main
Tracheotomy
electromagnetic derived units, including farad, henry, watt, tesla, weber, volt, ohm, and coulomb. Two derived units, lux and lumen, were based on the new
History_of_the_metric_system
Visual content generation through artificial intelligence
(Drawing Operations Unit: Generation 1), an ongoing collaboration between the artist and a robotic arm. In 2019, Chung won the Lumen Prize for her continued
AI_art
Organelles present in endothelial cells of blood vessels
trilaminar unit membranes. These clusters have the ability to provide a trans-endothelial connection between the extravascular space and the vascular lumen. VVOs
Vesiculo-vacuolar_organelle
American municipal police force
temporary floodlight tower deployed under the program approximately 600,000 lumens, roughly four times brighter than the brightest lights at Yankee Stadium
New York City Police Department
New_York_City_Police_Department
Overview of and topical guide to the metric system
as base units, meaning all other needed units of measure could be derived from them. International System of Units (SI) is the system of units that has
Outline_of_the_metric_system
Description of the average spectral sensitivity of human visual perception of brightness
slight mismatch between the definition of the lumen and the peak of the luminosity function. The lumen is defined to be unity for a radiant energy of
Luminous_efficiency_function
that the indemnity can not be larger than the loss Astra castra, numen lumen The stars my camp, the Deity my light. astra inclinant, sed non obligant
List_of_Latin_phrases_(full)
Functional unit of nephron
capillaries consist of a tube lined by endothelial cells with a central lumen. The gaps between these endothelial cells are called fenestrae. The walls
Glomerulus_(kidney)
64th season in franchise history
Game Book Week 16: Minnesota Vikings at Seattle Seahawks – Game summary at Lumen Field, Seattle, Washington Date: December 22 Game time: 3:05 p.m. CST/1:05 p
2024_Minnesota_Vikings_season
American telecommunications company
while CenturyLink acquired Qwest (formerly US West) in 2011, renaming to Lumen Technologies in 2020. In 1983, the US Department of Justice reached a settlement
Verizon
2023–2024 concert tour by Taylor Swift
Archived from the original on January 5, 2023. Retrieved January 5, 2023. "Lumen Field Concert History". Concert Archives. January 5, 2023. Archived from
The_Eras_Tour
Cell organelle that packages proteins for export
is in contrast to the ER, which has soluble proteins and enzymes in its lumen. Much of the enzymatic processing is post-translational modification of
Golgi_apparatus
A person who holds an office
example of an institution or business, or particularly of a war or military unit, is a history written as a commission, with the assumption of co-operation
Official
Business
lamp takes for the brightness of the energy-saving level to drop to one lumen. For lamps without an energy-saving level (e.g. P3, P4, P5), the time is
Ledlenser
travel, tourism, insurance
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travel, tourism, insurance