But, that's neither realistic nor fun. You'd be surprised at how far light can travel through diffuse reflection (Which is what the "ambient lights" try to emulate without taxing the system in a way actual diffuse lighting would require). Also, a lot of dungeons are exposed to the air, and do have "real" light sources - Bioluminescence, illuminated particles, torches, skylights, undying candles, etc.
And I do have to use Night Eye to see in the less-illuminated dungeons. Change your monitor/TV settings.
I have done spelunking over a couple of summer and caves are not lit with bioluminescence. At best you will see a tiny tiny speck from a worm that is lit up but that is it. Even a short way into a cave cause the light level to drop very quickly especially if you have to turn corners in which case say bye bye to the sunlight. I can understand that its nirn and their caves are different but even the caves that don't have magic glowing fungus are still way to bright.
http://www.youtube.com/watch?v=oGdAFEgyY-c The dungeons of Ivellon is arguable the absolute best dungeon mod for oblivion and you had to light the torches and chandeliers as you went along. This made it very atmopsherice and added some challenge because sometimes you could hear stuff but you couldn't see it. While you could cheat with night eye it was more fun to use a torch or lightspell. It was very fun and more realistic since I still can't figure out who exactly lights all those candles for the crypts when everyone is dead.
I tried adjusting the gamma but it still doesnt solve the ambient magical light from nowhwere. I am just pissed that they gave me an awesome candle spell and there is virtually nowhere to use it.