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  

/ lʌks /

verb

1. informal to clean with a vacuum cleaner

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Lux. ² British  

abbreviation

1. Luxembourg

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lux ³ 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 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

I approached a lot of this series by making sets: I created the world, created the environment, the way I would like for it to exist in my lux space, in my lux life.

From Los Angeles Times • Oct. 16, 2023

Indirect sunlight is anywhere from 10,000 to 25,000 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

The Count, the invisible providence of this invisible world, alone could give it external life and utter the fiat lux of eternity.

From The International Monthly, Volume 4, No. 2, September, 1851 by Various