f.lux (pronounced 'flux') is a cross-platformcomputer program that adjusts a display'scolor temperature according to location and time of day, offering functional respite for the eyes. The program is designed to reduce eye strain during night-time use, helping to reduce disruption of sleep patterns.^[2][3]

Functionality[edit]

Feb 24, 2021 f.lux does its job without problems. It features an override button, so if you're doing color sensitive work you won't be disturbed by a changing screen. It could be improved by automatically finding your latitude, or at least being able to calculate latitude based on your named location, but that's a small issue. F.lux warms up your screen at night to help you relax and wind down before bed. Created in 2008 to help screens look more like a book, f.lux is now informed by science in sleep and circadian biology to help you adjust your body's sense of night and day.

Upon installation, the user can choose a location based on geographic coordinates, a ZIP code, or the name of a location. The program then automatically calibrates the device display's color temperature to account for time of day, based on sunrise and sunset at the chosen location. At sunset, it will gradually change the color temperature to a warmer color and restore the original color at sunrise.^[2][3]

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.^[2][3] Times can be inverted on f.lux for PC to provide warm lighting during the daytime (for people who work at night).^[4] The program can control Philips HueLED lighting, so that the color temperature of house lights follows f.lux's settings.^[5]

Platforms[edit]

The program is available for Microsoft Windows, macOS and Linux (except for Ubuntu 18.04 LTS). It is also available for iOS devices, although it requires the device to be jailbroken.^[6]Apple has not allowed the application in its App Store due to its use of restricted developer tools.^[7] The developer briefly hosted an Xcode project on GitHub, allowing iOS 9 users to sideload the application onto their devices, but retracted it at the request of Apple.^[8] Following Apple's announcement of a similar function, called Night Shift, in iOS 9.3, the developer called upon Apple to provide developer tools and to allow their application into the App Store.^[9] A preview version for Google's Android system is available.^[10]

Efficacy[edit]

f.lux proponents hypothesise that altering the color temperature of a display to reduce the prominence of white–blue light at night will improve the effectiveness of sleep. Reducing exposure to blue light at night time has been linked to increased melatonin secretion.^[11] Although the developer provides a list of relevant research on their website, the program itself has not been scientifically tested to determine its efficacy. In spite of this, f.lux has been widely and positively reviewed by technology journalists, bloggers, and users.^[2][3][6]

See also[edit]

References[edit]

1. ^'f.lux for iOS'. f.lux. Retrieved October 13, 2018.CS1 maint: discouraged parameter (link)
2. ^ ^abcdZukerman, Erez (October 31, 2013). 'Review: f.lux makes your computer usable at night'. PC World. Retrieved 3 March 2015.CS1 maint: discouraged parameter (link)
3. ^ ^abcdTanous, Jim (October 15, 2014). 'Save Your Eyes and Improve Your Sleep with f.lux for OS X and Windows'. TekRevue. Retrieved January 15, 2016.CS1 maint: discouraged parameter (link)
4. ^'f.lux: F.A.Q. - I work nights. How do I flip the day and night settings?'. justgetflux.com. Retrieved 31 October 2016.CS1 maint: discouraged parameter (link)
5. ^'f.lux has been updated to a new version'. justgetflux.com. Retrieved 31 October 2016.CS1 maint: discouraged parameter (link)
6. ^ ^abHoffman, Chris (October 23, 2014). 'Reduce Eye Strain and Get Better Sleep by Using f.lux on Your Computer'. How-To Geek. Retrieved January 15, 2016.CS1 maint: discouraged parameter (link)
7. ^Hern, Alex (January 12, 2016). 'Apple promises a good night's sleep with new iPhone feature'. The Guardian. Retrieved January 20, 2016.
8. ^Tepper, Fitz (November 12, 2015). 'F.uxd: Apple Says Screen Brightness App Violates Developer Agreement'. TechCrunch. Retrieved January 15, 2016.
9. ^Perez, Sarah (January 15, 2016). 'F.lux Asks Apple To Let Its Screen Color Adjustment App Back Into App Store'. TechCrunch. Retrieved January 20, 2016.
10. ^'f.lux Home Page'. f.lux. Retrieved September 21, 2016.
11. ^Takeshi, Morita; Hiromi, Tokura (1996). 'Effects of Lights of Different Colour Temperature on the Nocturnal Changes in Core Temperature and Melatonin in Humans'. Journal of Physiological Anthropology. 15 (5): 243–6. doi:10.2114/jpa.15.243. PMID8979406.

External links[edit]

• The Benefits of Avoiding Blue Light Before Bedtime: how filtering out blue light from screens improves sleep quality.

F.lux is a little freeware tool which adjusts the color of your screen depending on the time of day in which you are.

Integrating with Google Maps, it allows you to set your current location; It then changes your monitor settings depending on whether it is day or night.

F.lux allows a gradual transition or can change it instantly, and you can determine the degree of heat which vary when it is night or day. You can also use F.lux to synchronize with your smart lighting system, in particular with Philips Hue and LIFX bulbs.

F.lux Vs Night Shift

f.lux 4.119 on 32-bit and 64-bit PCs

Flux Mac Download

This download is licensed as freeware for the Windows (32-bit and 64-bit) operating system on a laptop or desktop PC from desktop enhancement software without restrictions. f lux 4.119 is available to all software users as a free download for Windows.

Flux Eye Software

The program was created by the developer as a freeware product, but donations for the continued development are highly appreciated. You may generally make a donation via the developer's main web site.

F.lux Review

F.lux Review

1. f.lux Download
2. Freeware Desktop Enhancement Software
3. Display Light Adjusting Software