"Move the slider so you can just barely see the symbol on the left."

cranks slider to max brightness

A horror game where visibility is limited because everything is so bright (like a planet really close to a star or something) could be interesting.

You’d have to find shade to see around you.

I go with the recommended bit for Doom 3 (yes, I'm old). Doesn't feel right with the brightness maxed, everything looks unnatural and it takes me out of the scene.