lumen

noun

lu·men ˈlü-mən How to pronounce lumen (audio)

plural lumens also lumina ˈlü-mə-nə How to pronounce lumen (audio)

: the cavity of a tubular organ or part

the lumen of a blood vessel

: the bore of a tube (as of a hollow needle or catheter)

: a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity

luminal adjective

or less commonly lumenal

ˈlü-mə-nᵊl How to pronounce lumen (audio)

Did you know?

There are two common units for measuring light, the candela and the lumen. Both are recognized as standard international units, which also include the second (for time), the kilogram (for weight), and the meter (for length). The candela is a measure of intensity; an ordinary candle gives off light with the intensity of about one candela. The lumen is a measure of "luminous flux;" a standard 100-watt lightbulb gives off 1500–1700 lumens. Luminous flux indicates how much light is actually perceived by the human eye. Technologies vary in how efficiently they turn electricity into light; halogen lights produce about 12 lumens per watt, ordinary incandescent lightbulbs produce about 15 lumens per watt, and compact fluorescent bulbs produce about 50 lumens per watt.

Example Sentences

Recent Examples on the Web This model also includes a 800 lumen LED bulb that should last between 15 and 20 years.

Alex Rennie, Popular Mechanics, 9 Aug. 2022 Inside, there are several essential survival tools, including a folding pocket knife, a paracord survival bracelet, and a high-lumen tactical flashlight, plus an 11-in-1 tool and first-aid supplies.

Rachel Klein, Popular Mechanics, 2 June 2022 Front-country campers, on the other hand, can sacrifice smaller size for a larger battery and higher lumen output.

Mike Richard, Men's Health, 13 May 2022 One lux is equivalent to one lumen per 10.8 square feet.

Wes Siler, Outside Online, 18 Aug. 2020 For sleep, your bedroom should be as dark as possible with no more than a single lumen of yellow light shining in the space.

Sonya Collins, Fortune, 27 Apr. 2022 There are a few key elements that set projectors apart, and one of the most important is brightness, measured in lumen.

Gabrielle Hondorp, Popular Mechanics, 22 Apr. 2022 This is because unabsorbed carbohydrate draws water into the intestinal lumen and is eventually fermented in the colon, with loose stools and gas production as the unfortunate by-products.

Patrick Wilson, Outside Online, 13 Apr. 2020 About half to three-quarters of ingested polyols get absorbed, meaning that a portion of them hang around in the gut’s lumen.

Patrick Wilson, Outside Online, 7 Aug. 2020 See More

单词	lumen
释义	lumen noun lu·men ˈlü-mən plural lumens also lumina ˈlü-mə-nə 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 luminal adjective or less commonly lumenal ˈlü-mə-nᵊl Did you know? There are two common units for measuring light, the candela and the lumen. Both are recognized as standard international units, which also include the second (for time), the kilogram (for weight), and the meter (for length). The candela is a measure of intensity; an ordinary candle gives off light with the intensity of about one candela. The lumen is a measure of "luminous flux;" a standard 100-watt lightbulb gives off 1500–1700 lumens. Luminous flux indicates how much light is actually perceived by the human eye. Technologies vary in how efficiently they turn electricity into light; halogen lights produce about 12 lumens per watt, ordinary incandescent lightbulbs produce about 15 lumens per watt, and compact fluorescent bulbs produce about 50 lumens per watt. Example Sentences Recent Examples on the Web This model also includes a 800 lumen LED bulb that should last between 15 and 20 years. Alex Rennie, Popular Mechanics, 9 Aug. 2022 Inside, there are several essential survival tools, including a folding pocket knife, a paracord survival bracelet, and a high-lumen tactical flashlight, plus an 11-in-1 tool and first-aid supplies. Rachel Klein, Popular Mechanics, 2 June 2022 Front-country campers, on the other hand, can sacrifice smaller size for a larger battery and higher lumen output. Mike Richard, Men's Health, 13 May 2022 One lux is equivalent to one lumen per 10.8 square feet. Wes Siler, Outside Online, 18 Aug. 2020 For sleep, your bedroom should be as dark as possible with no more than a single lumen of yellow light shining in the space. Sonya Collins, Fortune, 27 Apr. 2022 There are a few key elements that set projectors apart, and one of the most important is brightness, measured in lumen. Gabrielle Hondorp, Popular Mechanics, 22 Apr. 2022 This is because unabsorbed carbohydrate draws water into the intestinal lumen and is eventually fermented in the colon, with loose stools and gas production as the unfortunate by-products. Patrick Wilson, Outside Online, 13 Apr. 2020 About half to three-quarters of ingested polyols get absorbed, meaning that a portion of them hang around in the gut’s lumen. Patrick Wilson, Outside Online, 7 Aug. 2020 See More Word History Etymology New Latin lumin-, lumen, from Latin, light, air shaft, opening First Known Use 1873, in the meaning defined at sense 1 Medical Definition lumen noun lu·men ˈlü-mən plural lumina -mə-nə or lumens 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
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lumen

noun

Did you know?

Example Sentences

Word History

Medical Definition

noun