Fluval lights for new 70 gal. Reef project.

Starting a new tank. It's 70 gal. 48"Wx18"Lx20"D and I plan on getting the fluval marine and reef full spectrum LED 46" lights for it. My question is, one or two? Would two make any difference, and what if I used one of those and a fluval aquasky LED together? I need some opinions on if this is enough for medium to high light requiring corals.