lux

¹ American  

[luhks] / lʌks /

noun

Optics.

plural

luces, luxes

1. a unit of illumination, equivalent to 0.0929 foot-candle and equal to the illumination produced by luminous flux of one lumen falling perpendicularly on a surface one meter square. lx

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Lux. ² American  

abbreviation

1. Luxembourg.

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Lux. ¹ British  

abbreviation

1. Luxembourg

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lux ² British  

/ lʌks /

noun

1.  lx.  the derived SI unit of illumination equal to a luminous flux of 1 lumen per square metre. 1 lux is equivalent to 0.0929 foot-candle

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lux ³ British  

/ lʌks /

verb

1. informal to clean with a vacuum cleaner

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lux Scientific  

/ lŭks /

plural

luxes

1. A SI derived unit of illuminance in photometry, equal to one lumen per square meter.

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Etymology

Origin of lux

1885–90; < Latin lūx light ¹

Compare meaning

How does lux compare to similar and commonly confused words? Explore the most common comparisons:

• lux vs. foot-candle

Example Sentences

They’re both lux and comfortable, providing excellent noise cancellation and a great listening experience.

From Salon • Nov. 20, 2025

If it’s streetwear, I still want it to look lux.

From Los Angeles Times • Apr. 21, 2022

For context, direct sunlight can range from 32,000 to well over 100,000 lux.

From The Verge • Feb. 9, 2022

After a hard-won renaissance, the future of the urban core, with its lux apartments, office towers, and retailers large and small, is entirely unclear.

From Seattle Times • Jan. 2, 2022

“Requiem aeternam dona ei, Domine, Et lux perpetua luceat ei,” prayed the priest, and even as we responded the unhappy spirit took its flight.

From The Span o' Life A Tale of Louisbourg & Quebec by McIlwraith, Jean Newton