Ace Lives not far from me and we helped each other install our skylights. I installed 1 18" skylight over my 4'x3'x26" that is supplimented by 6 48" T5s
This is the Dome
my fat head for size comparison
waiting on a new tank 'cause this one had a loose seam but this is about 5 or 6 pm. this thing is way bright at about 1:30
here is a shot of the light over the tank