Usually play at night with a dim yellow light behind the monitor.
SDR on my new monitor 50% both brightness and contrast, was MUCH lower on my older panel (something like 15 brightness, 30 contrast)
HDR unchanged, supernova enough as it is
No question is dumb if you do not know the answer.
Q: How can you move on in life if all you care about is pussy and videogames?
A: You don't.