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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.
Examples of lumen in a Sentence
Jamie Spain, Condé Nast Traveler, 9 Oct. 2024
That’s up from 1,800 ISO lumens for the original Xgimi Aura, which should improve the Aura 2’s performance when used in rooms where ambient light can’t be completely eliminated.
—Andrew Liszewski, The Verge, 6 Sep. 2024
The laser light source puts out 1,000 lumens of color/white brightness.
—Paul Ridden, New Atlas, 19 Sep. 2024
Most models will have between 100 and 1,000 ANSI lumens.
—Bestreviews, The Mercury News, 18 Sep. 2024
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Cite this Entry
“Lumen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lumen. Accessed 22 Nov. 2024.
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lumen
noun
or lumens
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