AI Sol super blue (not sure the of your tank). I'm thinking 2 modules for a standard 75. This is what I rock on the big reef and I keep a ton of sps. Gotta be careful when you fist set them up. I started at 30% on all 3 colors and upped it 10% a week till I was at 100% then I moved them closer to my water (they are 15 inches from the surface now). Pricy yes, but I never have to buy bulbs... And the whole set up only uses like 80watts or something crazy like that
Heidi