That light should work just fine. Do you have any idea on how many plants you are going to run in your 4×4? I initially started out with a mid level blurple, it did great during veg and I got a decent harvest out of them, but that light did not have the intensity needed for better flowering. I recently built 4 CREE COBs from rapidLED and the plant I have in flower is producing much bigger buds with the additional light.
