Had another look at the p450 and it is crappier than what i thought. Please dont buy it, you will throw your money away. Alll of those amazon sold, blue and red with a few more wavelengths are crappy as Fk.
Get a light based on white light. For that space: not that many lights that works well for a 5x5, to get that kind of throw you need sometthing really large. Better think of 2-4 smaller lights.
Check out this company which is a sponsor of this forum: horticulturelightinggroup.com.
Their finished lights are a bit expensive but they have several diy options. Theres also a few other US options. Another alternative is buying some gear from alibaba.
Do you have a budget?
My standard advice for US located is HLG qb96 Diy. Your space could be done with 6 of those (about 400$) and 3 meanwell xlg240 drivers (another 100$ approx) and plus cost of hanging, cables and frame. Its the best price i can find in us for something good and backed up by proper warranty.