Ouch. 2 would not be cost effective. California lightworks have American made lights with excellent warranties for around the same price as HLGs. Go to their home page look at the reviews and the yield increases that commercial growers got. You can get a true 400w led, 4x4 flower coverage for 450 out the door with incredible customer service warranty and American madeSo I'd need 2 of those to flower in the corners of even a 4x4... I appreciate the help, but it doesn't fit my needs and there are much less expensive options for that coverage.
Id rather drop 1100 on a top of the line G8 (won multiple awards as best LED and provides extremely even coverage in a 5x5, like over 1000 PPFD in the corners at 18 in) and save 300 bucks.
I went ahead and ordered 4 QB96 kits, too. 260$ plus the cost of drivers is less than 500$ total and they can be configured any way.