lol, this is one of the brightest on the market but it's far from "retina-searing", and the maximum brightness of these TVs are not sustainable. The max ~5000nits for TCL's current flagship for example IIRC lasts less than 15s, and while that's generally enough, it doesn't reach too wide an area on the screen either, though I don't remember the exact numbers. One can only bring out that maximum contrast in certain scenes of a very limited selection of HDR clips that are actually mastered for ~2000nits(currently rare even for Dolby Vision), from there the processing chip takes over and decides which details get bumped to max, so it's actually further brightening(through effectively "guessing") certain areas beyond even the DR of HDR clips, sort of like Sony's DSEE frequency range extension in audio. It's a processing technology and approach as much as it's a backlight technology.
So just to be clear, a clip mastered for ~2000nits may not be reproduced 100% to intent on the QM8, depending on the size of the highlight areas and how bright they are, but generally the film companies try to be forgiving and attempt to leave some headroom in most of the scenes, leaving the best panels underutilized instead.
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