How about we just flat out say that those "blurple" lights are NOT the best thing out there for blooming ---- period!
Wasting time on under powered and poorly color banded LED's is never worth the price..
I just got off my butt to finally try out some pretty nice, direct 1K+ replacement LED bank's..
Now then, for your 5x5 tent... I might say that a HLG Lm301B Samsung LED based set with Cree 660nm band reds (rspec - model) run by a Mean well 550 driver would be the small end of what I would get. This unit runs at 480w.
Personally, I just sprung for 3 boards with the Lm301H updated LED's. This delivers more umals of light energy per each LED.
These were built to order for me and cost me just under $500 each vs the $850 for a name brand HLG. Same brand LED's (Samsung and Cree) Plus the same driver unit.
These guys get their components at the same place as HLG too.
You can step up one more level and go to the DE HID equiv. in an 600w HLG system.
Crack yer wallet open for that by HLG or look to about $710 bucks from my custom builder....
Same warranty as the HLG pricey units too...