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    FWIW, Apple and Microsoft are going to integrate f.lux like features into their desktop OSes soon. I know the Insider builds of Windows has the feature. iOS has had night shift for a while, and now thats coming to macOS.

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      Linux has redshift [ http://jonls.dk/redshift/ ]

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        Thank you for the reminder to blog my wrapper script with cloudiness adjustment.

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        For those of you with Amazon fire tablets, this is built into their OS as well. It’s also possible to change the screen temperature in the graphics card settings for AMD cards if you are having trouble getting f.lux to work on multiple monitors on pre-10 windows versions.

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          I’ve wondered on the Fire tablets how effective it really is. I’ve tried the built in Blue Shade and it makes everything very red, uncomfortably so. I found Twilight more comfortable to look at, but still not as comfortable as f.lux on a laptop or Night Shift on an iPhone. I’ve actually found f.lux to be the best that I’ve tried.

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          Cyanogenmod has had this for a while.

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            s/are going to/has in Apple’s case. Witness “Night Shift” mode for IOS.

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            I’m surprised that more people aren’t aware of this.

            For normal household lighting, I don’t see any reason to buy bulbs above 3000 K. It’s probably different in an art gallery where you want something similar to natural light (5500 K) to bring out all the colors, but regular lights should be warmer (which means cooler on the Kelvin scale, because human psychology).

            Office/airport fluorescent light is horrible. It’s not even energy-efficient anymore. LEDs should be installed.

            I have my laptop at 5000 K during the day (default/no-Flux is 6500 K) and have it winding down to 2500 K by 10:30, except when I’m watching a movie. That seems to work for me. It has become noticeably easier to go to bed at night.

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                It’s a decent setting for watching movies, but given the amount of time you spend looking at white backgrounds on the web, I find that 6500K gives me a headache.

                6500K is the light of an overcast day (the sun is 5000-5500 K) which is great for some kinds of nature photography and fine in an outdoor setting, because the light is diffuse and fairly dim. Staring at a 6500K light source like a monitor, on the other hand, I find unpleasant.

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              I can definitely confirm that my sleep latency is substantially lower when I use a yellowing color correction on my phone.

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                So the article is a bit pop-sciencey, but it is spot on.

                I love my Gunnar glasses, and I use flux/redshift on all my devices. At the office with the bright lights and computer screens I wear the glasses basically all day, otherwise I get headaches and can’t sleep. I got a pair for my girlfriend and she loves them too. Its one of those things where you don’t realize how stressful artificial light is until you block it with blue-light blocking glasses.

                I also make it a point to spend some time in natural light in the morning and noontime, but while under flourescent lights or looking at screens, I wear my glasses.

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                  If natural sunlight doesn’t bother you but indoor lights do, I think that’s something other than the color temperature, because indoor lighting is typically less blue than sunlight is. They do sell lighting with a color temperature matching sunlight (labeled “daylight” bulbs usually), but many people perceive that as too harsh a white, so for indoor lighting the orange-shifted “warm white” bulbs are more popular.