@Quenti I've had this once: I suddenly started to feel dizzy and seeing blurry (even with glasses on) but it wasn't a brightness-only issue.

The brightness itself was not that high but a long day search stuff online (stupid job offers at that time) and reading text on white background for a long time was the cause. At this point I just stopped using the computer and and had to lie down on a bed…

So if you're referring to that kind of migraine, Low brightness/color temp won't help

@sophie