^^Been using f.lux on both Windows 10 and Ubuntu Linux for quite a while now. It's always been totally reliable on both systems, and has definitely reduced the feeling of the display being too "intense" for my visual processing.
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operating systems doing it natively?
Pretty much all operating systems these days will let you alter things like the colour balance, contrast etc. of your monitor on a user-by-user basis without needing any additional software. This is very useful if your preferred settings don't suit other people who have to use the same machine. That also applies to "accessibility" features, such as text-to-speech, setting a larger default font size etc. which are intended for people with visual impairments but can be just as useful for some autistic or dyslexic people.
Something else to consider is the lighting you use when you are at your PC. For example, I always have a desk lamp positioned to illuminate the wall behind my monitor, as I find it very overpowering when the screen is a lot brighter than the surroundings in my peripheral vision.
Another consideration is whether to opt for a screen with a glossy finish or matte finish. Glossy screens generally have more contrast, but are more prone to distracting reflections of your surroundings. Personally, I find a matte screen much easier to work with. I prefer the softer contrast, and my depth perception is not too good, which makes discriminating between the screen and reflections more difficult for me.
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