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

The couple tied the knot in 2014 with a lux Miami wedding and sealed the deal with a three-part honeymoon extravaganza.

From Los Angeles Times • Aug. 23, 2023

“It puts out 10,000 lux, the approximate light intensity of a cloudy day,” Avery said.

From Seattle Times • Nov. 23, 2022

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

From The Verge • Feb. 9, 2022

Near this aqueduct was a temple of Juturna; "Te quoque lux eadem, Turni soror, �de recepit; Hic ubi Virginea campus obitur aqua."

From Walks in Rome by Hare, Augustus J. C.