If you put 24leds without optics you will be in good shape.I ordered myself 36 from satisled.com and use meanwell 48d drivers.
Is dimmable a neccessity for these reef kits? I'm looking at that website and they have a constant current driver kit. The 8x3watt led kit... for 37 bucks. I'm thinking this would be awesome for my 3gal rimless build... I think that would be more than enough for SPS in a small, shallow tank...
That's going to be way too much if it's not dimmable...