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f.lux offers a variety of color profiles and pre-defined temperature values, modifying program behaviour for specific programs or activities; including a mode for film watching, decreasing red tinge (for 2.5 hours), and a darkroom mode that does not affect night-adapted vision. Times can be inverted
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secretion in a 1996 study but a 2018 study showed that changing the spectral composition of self-luminous displays without changing their brightness settings may be insufficient for preventing impacts on melatonin suppression.
350:, was shown to have no effect on sleep outcomes (sleep latency, duration, efficiency and wake after sleep onset) in a 2021 study on 167 college undergraduates. f.lux has been widely and positively reviewed by
346:. Although the developer provides a list of relevant research on their website, the program itself has not been scientifically tested to determine its efficacy, and the equivalent Apple program,
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318:, in iOS 9.3, the developer called upon Apple to provide developer tools and to allow their application into the App Store. A preview version for Google's
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f.lux proponents hypothesize that altering the color temperature of a display to reduce the prominence of white–blue light at night will improve
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at the chosen location. At sunset, it will gradually change the color temperature to a warmer color and restore the original color at sunrise.
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the application onto their devices, but retracted it at the request of Apple. Following Apple's announcement of a similar function, called
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693:"Effects of Lights of Different Colour Temperature on the Nocturnal Changes in Core Temperature and Melatonin in Humans"
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on f.lux for PC to provide warm lighting during the daytime (for people who work at night). The program can control
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according to location and time of day, offering functional respite for the eyes. The program is designed to reduce
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Two photos of a screen stitched together, f.lux disabled (on the left), and f.lux's default settings (on the right)
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796:"Does iPhone night shift mitigate negative effects of smartphone use on sleep outcomes in emerging adults?"
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Duraccio, Kara M.; Zaugg, Kelsey K.; Blackburn, Robyn C.; Jensen, Chad D. (August 2021).
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due to its use of restricted developer tools. The developer briefly hosted an
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642:"F.lux Asks Apple To Let Its Screen Color Adjustment App Back Into App Store"
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506:"f.lux: F.A.Q. - I work nights. How do I flip the day and night settings?"
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560:"Reduce Eye Strain and Get Better Sleep by Using f.lux on Your Computer"
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476:"Save Your Eyes and Improve Your Sleep with f.lux for OS X and Windows"
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614:"F.uxd: Apple Says Screen Brightness App Violates Developer Agreement"
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734:"Does the iPad Night Shift mode reduce melatonin suppression?"
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On installation, the user can choose a location based on
283:(except for Ubuntu 18.04 LTS). It is also available for
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during night-time use, helping to reduce disruption of
334:) blue lights at night time was linked to increased
441:"Review: f.lux makes your computer usable at night"
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732:Nagare, R; Plitnick, B; Figueiro, Mg (May 2019).
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16:Program to adjust a display to reduce eye strain
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531:"f.lux has been updated to a new version"
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697:Journal of Physiological Anthropology
244:to account for time of day, based on
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228:A screen in F.lux's "darkroom mode"
739:Lighting Research & Technology
612:Tepper, Fitz (November 12, 2015).
330:Reducing exposure to bright (1000
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640:Perez, Sarah (January 15, 2016).
474:Tanous, Jim (October 15, 2014).
584:Hern, Alex (January 12, 2016).
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271:The program is available for
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812:10.1016/j.sleh.2021.03.005
389:Light-on-dark color scheme
369:Oswald Labs § Agastya
364:Electronic media and sleep
344:the effectiveness of sleep
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194:(pronounced "flux") is a
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752:10.1177/1477153517748189
62:Michael Herf, Lorna Herf
19:Not to be confused with
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352:technology journalists
234:geographic coordinates
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868:Utilities for Windows
322:system is available.
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878:Utilities for Linux
873:Utilities for macOS
486:on October 17, 2014
384:Redshift (software)
379:Red Moon (software)
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710:10.2114/jpa.15.243
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80:February 2009
72:F.lux Software LLC
58:Original author(s)
667:"f.lux Home Page"
273:Microsoft Windows
242:color temperature
206:color temperature
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261:LED lighting
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156:Available in
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68:Developer(s)
651:January 20,
625:January 15,
597:January 20,
569:January 15,
564:How-To Geek
490:January 15,
417:October 13,
348:Night Shift
316:Night Shift
306:, allowing
302:project on
258:Philips Hue
181:justgetflux
857:Categories
780:2021-09-16
646:TechCrunch
619:TechCrunch
540:31 October
515:31 October
395:References
292:jailbroken
210:eye strain
118:0.9986
888:Usability
828:233299395
336:melatonin
310:users to
296:App Store
267:Platforms
203:display's
820:33867308
770:31191118
480:TekRevue
446:PC World
358:See also
326:Efficacy
312:sideload
238:ZIP code
170:Freeware
106:Windows:
761:6561503
719:8979406
452:3 March
320:Android
246:sunrise
176:Website
165:License
159:English
146:Android
134:Windows
108:v4.120
87:2009-02
85: (
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818:
768:
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304:GitHub
250:sunset
111:macOS:
893:Sleep
824:S2CID
671:f.lux
412:f.lux
308:iOS 9
300:Xcode
285:Apple
281:Linux
277:macOS
192:f.lux
142:Linux
138:macOS
31:f.lux
816:PMID
766:PMID
715:PMID
678:2016
653:2016
627:2016
599:2016
571:2016
542:2016
517:2016
492:2016
454:2015
419:2018
279:and
248:and
236:, a
183:.com
116:iOS:
113:41.5
808:doi
756:PMC
748:doi
705:doi
332:lux
288:iOS
150:iOS
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