lumen
noun
lu·men
| \ ˈlü-mən
\
\
plural lumens
also lumina\ ˈlü-mə-nə
\
\
Definition of lumen
1
: the cavity of a tubular organ or part
the lumen of a blood vessel
2
: the bore of a tube (as of a hollow needle or catheter)
3
: a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity
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Other Words from lumen
luminal
or less commonly lumenal \ ˈlü-mə-nᵊl
\
adjective
\
adjective
Examples of lumen in a Sentence
Recent Examples on the Web
Spec-wise, the HU85LA will offer 2,500 ANSI lumens of brightness and a 4K UHD resolution as well as USB, Ethernet, and HDMI ports for connectivity. — Chaim Gartenberg, The Verge, "LG’s new short throw 4K laser projector is now available for $6,000," 24 July 2019 Biolite Headlamp 200 Price: $40 Biolite takes a lot of the design features that made its 330-lumen headlamp a runaway success, and offers it in a more affordable package with fewer lumens, but no rear battery. — Popular Mechanics Editors, Popular Mechanics, "All the Coolest New Gear From Outdoor Retailer 2019," 21 June 2019 Rated at 806 lumens, the dimmable E26 bulb supports three color temperatures: 2200 Kelvin (warm glow), 2700 Kelvin (warm white), and 4000 Kelvin (cool white). — Thomas Ricker, The Verge, "Ikea’s economical range of smart lights continues expanding," 11 July 2019 For backup, Maglite’s compact Mag-Tac CR123 ($83) throws 310 lumens a whopping 600 feet, has a power saving mode, and clips onto your belt. — Nick Davidson, Outside Online, "The Ultimate DIY Bug-Out Bag," 27 June 2018 Different bulbs require different wattage, but Mr. Conway cited 100 lumens per watt as a common level of efficiency, so that 1,600-lumen bulb burns a mere 16 watts of power. — Kathryn O’shea-evans, WSJ, "Goodbye, Showy Chandeliers. Hello, Low-Key Lighting That Transforms Rooms," 25 Jan. 2019 The technology of the structure’s core–made from proprietary LED backlighting and Swarovski’s proprietary active panel technology–paired with the crystals to emit over 100,000 lumens that can be seen from all angles. — Lucia Tonelli, ELLE Decor, "How Architect Daniel Libeskind Redesigned the Rockefeller Center Christmas Tree Star," 15 Nov. 2018 The sleek DayBlazer 1100 pumps out 1,100 lumens up front, while its partner’s three LEDs pack a 125-lumen punch with 270 degrees of visibility. — Nick Davidson, Outside Online, "8 Pieces of Bike Gear to Keep You Safe on Your Commute," 23 May 2018 Too many lumens up the coast in Oakland, with that juggernaut named the Warriors. — Bryce Miller, sandiegouniontribune.com, "Memo to Luke Walton: Here's comes LeBron ... and all that comes with it," 2 July 2018These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lumen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
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More Definitions for lumen
lumen
noun
lu·men
| \ ˈlü-mən
\
\
plural lumina\ -mÉ™-nÉ™
\
or lumens
\
or lumens
Medical Definition of lumen
1
: the cavity of a tubular organ or part
the lumen of a blood vessel
2
: the bore of a tube (as of a hollow needle or catheter)
3
: a unit of luminous flux equal to the light emitted in a steradian by a uniform point source of one candle intensity