The T4-V725 was made for a 2x4, but you would get good results with a T3 or T2. The T2 isn't going to light the whole area but will get most of it.
Hey man Cob leds are the shit for vegetation And for the very end of its flower cycle want a high intensity light for the transition
At the beginning they will flourish beautiful. And at the end like the last week it will frost them nugs up good. Need to invest in at least a 250 watt hps/mh setup. You will be glad u did. They are cheap too probably 80 to 100 bucks for everything