best quality, yeah right.
Best bins for Osrams are $6+/pc and to achieve the very best results you'd have to drive them at 400mA... For 200w that would be $1200 worth of LEDs, plus drivers, PCBs, casing & fans and some more to pay the guy who's designing them panels... If they were actually using the best LEDs out there the panels would cost at least two grand for 200w so I really doubt they're using the best quality LEDs as they seem to claim
Edit: but still, lumigrow is quite respectable, the panels aren't drop shipped from China and seem very well made. Well above most panels on the market that's for sure but the price is quite high too! In this business, I guess you get the quality you pay for.