To flower a 10 x 10 is going to put a dent in your wallet you can’t go wrong with HLG but if upon a budget look at Medic grow they have some good 420 sales https://medicgrow.com/
Pictured is a 600w King Plus and a Bestva 600.(cob). Both are about 125 watts each. I used them over a 24x24" frame in a 30x30" enclosure. They got the plant off to a good start. Mid flower I upgraded to a Sonofarm 400w.