- 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. Symbol: lx
Origin of lux
1885–90; < Latin lūx light1
Also called meter-candle.
[fee-aht loo ks; English fee-aht luhks, fahy-uh t]
- let there be light.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lux
To put that into perspective, indoor lighting is about 100 lux, while a bright, sunny day can hit 50,000 lux or more.
The “gold standard” dose is 30 minutes of 10,000 lux light, one hour of 5,000 lux light or two hours of 2,500 lux light.
However, an overcast sky (like you see often during the winter) usually ranks at only 1,000 lux or lower.
Lux entered the stage dressed head to toe in white, accompanied by an entourage.
Even Loaded Lux could not keep a straight face, smiling as his competitor established a clear, early lead and never let up.
Lux Mundi—what a curious device to connect with such a subject!
The same is true of any other matter, lux metal or relux—it will penetrate.
The lux is stronger than relux, and is therefore used for an outer shell.
In the beginning the creative word was Fiat lux—let there be light.Printing and the Renaissance
John Rothwell Slater
In the Vulgate, Fiat lux, which is much the same as the Greek.
- 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-candleSymbol: lx
C19: from Latin: light
- NZ informal to clean with a vacuum cleaner
C20: from Electrolux, a vacuum-cleaner manufacturer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for lux
unit of illumination, 1889, from Latin lux "light" (see light (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
- The International System unit of illumination, equal to one lumen per square meter.candle-meter meter-candle
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- A SI derived unit of illuminance in photometry, equal to one lumen per square meter.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.