After I made the panel at 200w, I thought to myself, If I put another 16 strips on the same 28"x18" cookie sheet, I would have 32 rows of 49 diodes on two C1400B drivers for 400w of power that would easily handle a 2'x3' area for both flower and veg, maybe even a 3x3 area.
On these flexible strips the diodes do not seem to get hot. I have them mounted on thin aluminum flat stock , but that was overkill. Now I have a backing aluminum cookie sheet and that seems just right, plus readily available either new or used. I saw one on ebay used in NYC for pickup only. A 400w cookie sheet with a couple of pc fans on them, maybe a couple thin angles attached with some 3m tape for extra dissipation. Too much fun and soo easy too. DIY like it was meant to be, fun.