Does F.lux actually work?



  • F.lux preportedly adjusts the color temperature of the display, which should make it easier to fall asleep. I stumbled upon it when searching for a program for adaptive nightmode on my laptop (I wanted a program to automatically change the brightness based on time of day).

    While it does seem a bit easier on the eyes, the orange hue at night mildly annoys me. I understand that orange is needed to cancel out the blue, but I'm wondering if this is honestly any better than simply turning down my display's brightness.

    I also heard about something called Gunnar which is apparently a similar concept, except it's glasses with orange lenses. However, I checked the cost and they seem a bit pricy.

    Tl; dr: How does F.lux compare to simply adjusting the display brightness or to Gunnar glasses? Does it legitimately help with sleep, or is it just the placebo effect?


  • f.lux team

    We have some data posted here, so I think you'll find that gunnar removes about 1/4 the melanopic light, similar to running f.lux at 5000K:

    https://fluxometer.com/rainbow/#!id=iPad Pro/6500K-iPad Pro&filter=filter/GUNNAR PPK

    https://fluxometer.com/rainbow/#!id=iPad Pro/5000K-iPad Pro

    We recommend much stronger settings that remove 90% of the light at night.