I usually game with the lights mostly off.
I used to play with the lights all the way off but...needless to say...
F.E.A.R.
Doom III
Unreal
Doom
Doom II
Condemned - XBOX360 demo
Have made me game with minimal lights on...
But, I mostly game with just a light on off in the corner of my room so I don't have any glare on the screen. And, I like it... future mrs. stud doesn't though...we'll have to work on that

And by 'we will have to' I mean "I will have to" lol.