&gt;That too was known for ages, and still no light changing apps for it like flux<p>How is Joseph Programmer von Notasleepscientist supposed to know that a blue-light dimming filter is something that he might want before he sees the effect in action? I&#x27;ll give some credit to f.lux for popularizing the idea, but once the idea is out there, there are only two ways you can implement it: postprocessing in software, or postprocessing in the CLUT. You wouldn&#x27;t need to know anything about how f.lux works to come up with one of them yourself, once you are aware of the idea.