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• lux
  lux

  noun

  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
• Lux.
  Lux.

  abbreviation

  Luxembourg.

lux

¹ American  

[luhks] / lʌks /

noun

Optics.

luces plural

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 /

luxes plural

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

A high level ranges from 1,614–10,764 lux, medium is 807–1,614 lux and low ranges from 270–807 lux.

From Seattle Times • Aug. 30, 2022

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

From Los Angeles Times • Apr. 21, 2022

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

From The Verge • Feb. 9, 2022

The Latin inscriptions, In luce spes, Post tenebras lux, and others, do not seem particularly appropriate to either the place or the occasion.

From The Portsmouth Road and Its Tributaries To-Day and in Days of Old by Harper, Charles G. (Charles George)