Need LED suggestions for 48 x 21 x 20 tank

Wont I get better spread coverage with 3 lights vs 2 even if the A360s are much stronger?

You would get better coverage side to side but not front to back. An extra Kessil means an extra gooseneck as well. Not sure where your overflow box conncerning mounting the middle Kessil. More Kessils, more cords. Just giving you some things to consider is all.
 
what about the new Kessil AP700? They claim 48" coverage. It seems basically just two A360we in one fixture with integrated wifi control.
 
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