I'd like *some* dungeons to be really creepy and/or really really dark, like in the video. But I'd also like a torch to be better than a low yield/level light spell, so that spells might be a good backup but not the full solution. I also loved the way there were torches and lanterns already there that you could light manually or with a fireball. But I also want the occasional well lit dungeon, especially active mines and the like. It would really add to the feeling if at some places, close to the ground, there were passages up to surface, and in other places windows in the rockside, where light lit up the area if it was during the day.
So, daylight should affect upper levels of a dungeon, with the occasional daylight lit room way below if it happened to be near a rockside (you may even find it to be an exit you don't really get to use without killing yourself
)
More variation between lit and dark dungeons, even if they are not quite as dark (complete blackness is a game design controversy) as in the video. A simple mod may fix that if lighting is done correctly.
Night eye is fine. Just make it variable in power. (100-skill)*normal vision + skill*night eye.