You could do something like this to get 400w at around 50% eff. You could make it fun and mix CRI and colour temps.
Horizontal/perpendicular length would be around 11.2cm and diagonal length around 15cm.
the drivers are hlg-240's. i think...i will see what ma
16 cobs in that area would sure kick out
i am not near the unit now
to see if i can hack at the heatsink..i doubt the layers are bolted together
if i could hack em in 4 i could make a spread out system..
and led boards are not shabby either as those quantums show..