Why link screen color to sundown and not sleep time?



  • Hey,

    just trying out this program to see if get to sleep faster at night.

    Now it's 16:30 and my screen turned orange with the sun going down.

    But is that necessary? I'm probably not going to sleep for another 7 hours, isnt that to soon to adjust the colors?



  • @sleepcat You can adjust the sundown color to be a bit lighter, then set bedtime color to really wind down. The f.lux team really tries to ask the easy questions and do the hard work for you, to make it more accessible. It threw me off a bit when I saw it, but it's the easiest thing they could think of to get your sleep time close to where it should be.



  • I only have a day and night slider on the PC version.

    Setting the times manually would be great. But without I guess I could just disable the whole automatics and activate it manually before I go to bed.

    Btw. how long before going to sleep should this be activated, how long does the body usually take to be affected?



  • @sleepcat Yep, you have the windows version, I didn't know because you didn't say, and you mentioned sleep time, so I thought you may have had mac.

    Anyway, I'd say 2-3 hours before sleep would be ideal.



  • Ok thanks for the info.

    Guess I´ll switch it manually until the PC version gets a manual timer setting..



  • The standard answer to this question is: "change your location setting to somewhere farther south, and/or wait for a new version of f.lux".

    Dark North Mode
    Less daylight during the winter
    Cycle based on sunrise/sunset is pointless in places where winter days are short.



  • That would work for the evenings, but would only shift the manual adjustment into the morning hours.



  • I don't mean change your time zone (east-west), but your north-south location. If you set it to somewhere closer to the equator, you can get more reasonable sunset-sunrise times, eg. 7pm-7am. You might have to move a little east-west too, to get it just right.

    On the other hand, it doesn't hurt to have a warmer screen when the sun goes down early. Blue light, or lack thereof, doesn't have much effect either way in the late afternoon and early evening. So you can use f.lux to better match the colour temperature of your screen to your room lights then, purely for aesthetics. Or not - as you like.

    The most important time is at night, especially the two hours before going to bed. But blue light even four or five hours before bedtime can have an effect. It depends how bright it is, and how long you're exposed. You should turn down the overall brightness of your screen at night, in addition to using f.lux.



  • @Elhem-Enohpi You're gonna be a regular here!


  • f.lux team

    @sleepcat we link it to sleep time in the Mac version. We're trying to understand the best way to offer timing, and we'll roll it in to the main version as soon as we think we're onto something.



  • There are three considerations for screen brightness and color shifting: 1) daylight (determined by sunrise, sunset, and sun height); 2) ambient lighting (whether you are indoors or outdoors, and whether the lights are on); and 3) the user's desired wake/sleep times. An ideal program will allow the user to fine-tune according to all of these considerations. For example, the monitor would automatically dim when in a dark room, but gradually, as the person (and/or his transition lenses) adjusts. It will also allow for those who unfortunately have to wake up before sunrise or work late night shifts. Also, you don't necessarily want to just limit the light levels to two levels. The indoor room might be a medium brightness with some blue light, which is different than the low blue light of between sunset and 2 hrs before bedtime, and then cut out all blue light after 2 hours before bedtime. The bedtime would be a set time on the clock and only change for daylight savings whereas the sunset time would vary daily with the actual sunset time.


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