It will be always too dark for some and there will be always someone who turn brightness up.
Night is dark, day is bright. Making a night bright enough so you can see everything clear enough is making a day out of night, it takes out of realism.
The only time i entered game lately, i entered some stone carved room and it hit me, that the walls was so bright, without any light source, yet it was middle of the night. the place was completly out of place.
I just want a movable light source and if there will be still people who turn their brightness up, its their business that they have to play in the middle fo a night, like it was a day.