lux

1 of 2

noun

ˈləks 

plural lux or luxes

: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter

lux

2 of 2

adjective

less common spelling of luxe

: luxurious, sumptuous

Five bedrooms are on the second floor, highlighted by the primary suite with luxe bathroom.

—Joey Morona

Glam up a room with luxe fabrics.

—Danielle Blundell

… this lux apartment (on paper at least) has it all: a 24-hour valet car service, spa, fitness center, pool, 24/7 room service and views of the … New Orleans skyline …

—Gabrielle Korein

Examples of lux in a Sentence

Recent Examples on the Web

Noun

After adjusting for demographic, lifestyle, health and environmental factors, the researchers found that any increase in light exposure above 3 lux during nighttime sleep was associated with measurable, subtle cardiac damage. — Barbara Mantel, NBC news, 10 Sep. 2026

For comparison, the study authors noted that 1,000 lux generally represents sunlight. — Mary Walrath-Holdridge, USA Today, 10 Sep. 2026

For quality sleep, experts say the bedroom should ideally be a maximum of 1 lux, which is quite dark. — Sandee Lamotte, CNN Money, 9 Sep. 2026

Sitting directly beside a window and looking out might expose you to around 1,000 lux. — Angela Haupt, Time, 4 Aug. 2026

Bright daytime light can be up to 5,000 lux. — Emily Kay Votruba, EverydayHealth.com, 25 June 2026

By comparison, the light in the Tick Tock was around 200 lux. — Literary Hub, 17 June 2026

Daylight on a cloudy morning measures around 10,000 lux. — Allison Palmer june 2, Sacbee.com, 2 June 2026

Word History

Etymology

Noun

Latin, light — more at light

First Known Use

Noun

1885, in the meaning defined above

Rhymes for lux

• chucks
• crux
• ducks
• dux
• flux
• klux
• plucks
• recce
• shucks
• sucks
• trucks
• tucks

Kids Definition

lux

noun

ˈləks 

plural lux or luxes

: a unit that is used for measuring the amount of light falling on a surface and that is equal to one lumen per square meter

Medical Definition

lux

noun

ˈləks 

plural lux or luxes

: a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter

called also meter-candle