Best cobs for 2,4m x 1,2m?

For a 4×8ft / 1.2×2.4m
I build up
3× 200W 4-COB-1-Meter-Bars
with HLG-185H-C1400B (dimable)
for a friend and he replaced 1200W HPS.
1st Run with LED
20% more Buds 50% lower electric bill
1k €'s Right Investment
 
I think i will go for 18 at 75w to save some money, ever have time to add more cobs ...

What driver would work fine with 18 cobs(vero29 50v) at 70w(1400ma)?
thats where the constant voltage drivers shine. you can double up # of cobs per driver later on as you grow
 
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