

I don’t see a fundamental reason why this couldn’t exist, because in principle it would be a pretty straightforward thing to implement. It sounds like what you’re asking for is essentially a low-pass filter for the brightness of the entire screen (or, more specifically, a filter for each color channel so that blue can be filtered more than red or green)
I think the largest barrier to making something like that would be graphics APIs, as you’d need to read/buffer the entire screen and then apply the filter to every pixel. It would also probably make videos and motion look weird. But, I don’t see why it couldn’t be done.









Also, TrueNAS loads entirely into RAM upon boot, meaning the SSD will only be used once when the computer is powered on. So apart from that few seconds, there won’t be any additional power draw from the SSD.