If that 1200w led (250-280 actual watt) u might want to look into getting another panel for flowering in a 4x4 . But something like 36 -30 inches seedling. 24-20 inches veg
12-18 inches flowering for a panel like that. But I'd use 2 for ur space for flowering.
Problem is the lower u put ur light the less area gets illuminated. Due to decreased spread. That light at optimum height wont leave a big enough footprint for a 4x4 tent in flower.