I just bought a new 4x65w pc (with moonlite) for my 75gal. On the spec sheet it says: "The PC's are definitely capable of providing enough spectral energy to properly keep and grow stony corals or clams. ********, Inc has been growing Acropora, Hdnophora, Favia, and Caulastrea for over 10 years with excellent growth and coloration"
I am also using an additional 110w PC that I had planned on replacing.
I know I have enough light for soft corals and posted the question about hard corals on this board. Most everyone said that I will NOT be able to grow hard corals with the lighting set-up I have. I am not ready for hard corals yet, but it will be interesting to see how everything else grows.