Tommy boy
Just take the butchers word
I think 2 cobs would work for your space . Maybe 4 if you wanted max lighting. But you are looking at around 500 bucks for 4 if you went auto cobs from bigsmo Buying the cobs driver and heatsinks separate would be half as much and you would have to build the light your self . I really think for your size grow led bulbs would work great. 4 100w equivalent bulbs put out about the same light as cobs running 50w .and you will spend 1/4 the cash. Just keep reading and find what you like best . Good luck on your adventure buddy .