f.lux is now installed

f.lux is the most powerful tool available for influencing your body’s sense of day and night with a screen. Based on your wake time and location, f.lux creates a lighting schedule for you that changes every day throughout the year.

You can change colors, location, and other settings from the f.lux menu.

f.lux menu

The f.lux menu is always located to the left of your system clock.

Getting started

  1. Set your location: f.lux works a lot better if it knows approximately where you are
  2. Choose your usual wake time. If you wake at a different time each day, you can pick your earliest time or something in the middle.
  3. Adjust f.lux’s color settings so it looks as warm as you like it.
  4. You can now disable f.lux for individual apps. To quickly disable, use Alt-End.
  5. Visit our support page: https://justgetflux.com/faq.html

New in v4 (2017)


  • A model of how light affects your body
  • Bedtime mode: warmer mode gets you ready for sleep
  • Backwards alarm clock: reminder not to stay up late
  • Presets to help pick your settings
  • Color filters for eyestrain and other uses
  • Wider range of color settings
  • New hotkeys to adjust color (Alt+Shift+PgUp and Alt+Shift+PgDn)


  • Reduced impact on game framerates
  • Resolution independent interface, for high DPI
  • DisplayLink works in a lot more cases now

Smart Lighting:

  • Hue integration now supports more light types
  • LAN API with support for telling other devices when f.lux changes

New in v3 (2013)

If you’ve used f.lux before, this version now has these changes:

  • Expanded color temperature settings, down to 2700K, and some presets lower than that, down to 1200K.
  • Display warms up as your backlight dims (works with laptops)
  • Movie mode
  • Disable until sunrise
  • A simple control for Philips Hue lights
  • Hotkeys to dim your screen (Alt-PgUp, Alt-PgDn), so desktop users can dim too, and a hotkey to disable (Alt-End)

More about f.lux

Computer screens, tablets and mobile phones emit full spectrum light around the clock, just like the sun. Exposure to blue light at the wrong time of day can keep you awake later and interfere with the quality of your sleep. f.lux tries to help this by removing blue and green light to help you wind down in the evenings.

It can take a few days to get used to the new colors at night, so we recommend setting the night-time colors in f.lux to whatever feels good to your eyes. After a few days with f.lux, experiment with the settings to warm things up a little more and find which color works best for you. Our default setting of 3400K on Windows removes about 3/4 of the blue and about half of the green light. You can remove even more alerting light by choosing “Expand color range” to unlock deeper colors in Windows (in the “Lighting at night” menu).

Thank you for trying f.lux! We are always working to incorporate the newest research into our software. We’d love to hear what you think.

Copyright f.lux Software LLC 2008-2017