They have a 2' X 2' spread at 13" above the water line. I am running 2 on my 4' X 2' 120g tank. I will be adding a 3rd module because I have some shadowing that I am not happy about, but I have plenty of light going into my tank.
Your tank is 4' X 3' correct? I could see you getting away with 3 modules arranged in a V pattern to start.



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