I just have to put in my $0.02 I like Overdirven x4 cant say enough about it!
I have 2 f32t8 ballasts powering 2 (1 each) t8 bulbs 5600k I think and it puts out more light than my compact flouresent that runs 4 55 watt 10,000 k daylight bulbs. Plus it was farily easy to wire everything.
Home Depot has a 4' shoplight on sale for $7 and that is what I am using as a tempoary reflector. I just gutted it and plan on using the ballast that came with it to light a 20 gal