Slow gradual transition to mirror the natural lighting



  • I just installed this excellent software and already recommended it to many of my friends.

    However, one somewhat obvious feature seems to be missing. Would it be possible to
    introduce as an option a gradual transition of the light temperature through out the day and night? E.g. 6500K at midday, gradually reducing to 2700K in early evening and further still as time approaches late night?



  • Here's a post that herf made on this:

    https://justgetflux.com/forum/topic/427/progessly-reduce-color-overtime/6

    @herf said:

    It's a lot harder to figure out circadian timing for 6 hour fades because we just don't have an intuition (or evidence) of how people react to them. They might be incredibly awesome, but we just don't have a good way to do the timing -- e.g., if you want to feel sleepy at 11PM, when exactly in the 6 hour fade will you start feeling more tired and how should the fade be shaped? Getting this wrong seems a lot worse than getting a 1-hour fade wrong.

    We do two slow fades in the Mac build and that will be coming to Windows soon.

    I guess we could open up some more parameters and let people try it out.

    Most circadian research is done with on/off signals (no fade at all) but recent work has started to consider fading too. At least the sunset is reasonably "about an hour" so that is why we do fades in that time scale.

    The Mac "late mode" is actually using a 90-minute fade now, but this is actually because it fit our morning model better.



  • Yeah @herf I'm wondering what the difference is between dim late evening natural light when it's cloudy, and brighter warm indoor light.

    I'm guessing we don't use cooler light indoors because for it to not have an impact (which I assume dim outdoor light has little effect), we'd have to have the light so dim it would be difficult to see.



  • My reason for using warm lighting indoors is, first and foremost, it's relaxing. When I'm getting ready for bed, I'm still using nothing but my red LED lights. It's absolutely amazing because I pair it with f.lux at 1200K and a very dim monitor setting.

    The only time I want cooler lighting indoors is when I'm doing some sort of project or when I'm cleaning or when I'm working on something, etc. I tried using Daylight bulbs for when I'm just sitting here relaxing, and it's a little bit unpleasant for me. I actually found myself feeling too warm after a couple of hours. As soon as I switched back to my 2700K lights, I cooled off. Interestingly, my 2700K LEDs generate more heat than my Daylight LEDs. Figure that one out! Why would I be getting hot and even slightly sweaty while relaxing with Daylight bulbs on but I could feel a bit chilly when relaxing with my 2700K bulbs? I'm guessing it has to do with my heart rate. I don't know.

    The only way I'd want my computer to mirror the kind of light the sun is producing at any time of day is if I woke up with the sun and I plan to be going to sleep with the sun. Since I don't do that, I always use f.lux manually. I switch to warmer colors when I'm ready for it.



  • Rather than playing with colour temperature is there a way the it could gradually dim the screen based on the transition between day/night? At the moment I use the ALT-PgDn/Up to dim in late afternoon.



  • @baldgeezer Give it a week or so, and set the color to a lighter setting you so adjust easier -- set it to maybe 4700K. Leave it there for a week, and make sure you're using the slow, 1 hour transition speed.

    Then, once you adjust, take it down to about 4000K. Leave it there for a week, then take it down to 3700K. Then a few nights later, 3400K. You see where this is going.


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