As of now my designer has assured me that 3 will be enough... says that they sometimes only do two and that they are as bright or brighter than the intellibrite. Hard to believe that but we will have to see. I am in the I have to trust him phase as any change now will slow us down and cost more money (gunite is shot and plumbing and electrical is complete) so we will see.We are grappling with this decision. Please update with how your microbrites turn out!