I have this starter kit grow light and i can lie i get depressed when i see the “4th week of flower” and my plants just hit puberty when indeed when i should be close.
I’ve got the TS 2000 growing good for me @ 300 actual watts should work for your 3x3 through flower but don’t get the 1000 it’s not enough for you - or look at HLG lighting.
Keep your eyes on Migro lights - Shane has just launched a class leading range and is soon to release one for the 3x3 ft market. I have the 120w Array and it’s just breathtaking for my 2x2