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

---

Lux. ² American  

abbreviation

1. Luxembourg.

---

Lux. ¹ British  

abbreviation

1. Luxembourg

---

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

---

lux ³ British  

/ lʌks /

verb

1. informal to clean with a vacuum cleaner

---

lux Scientific  

/ lŭks /

plural

luxes

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

---

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

Also, Garmin based this “unlimited” claim off three hours per day outside in 50,000 lux conditions.

From The Verge • Feb. 9, 2022

Above, two towers will house 1,048 apartments with curved balconies and lux amenities.

From Seattle Times • Nov. 12, 2021

This is commemorated in the Lossiemouth Burgh seal, which represents the saint with his lantern and bears the motto: Per noctem lux.

From A Calendar of Scottish Saints by Barrett, Michael