welcome to the site.lets start with cob brands,they are all very close in performance now with vero having a slight edge as the best,plus with built in holders you cant go wrong with the vero 29se.you only need reflectors if you run the cobs at higher power and will have them higher over the plants or you are growing very tall plants.i like bare cob setups best.as far as what you need and how many,i cant pick that stuff for you ,not enough info for me to even properly guide you.i can say i like 20w per sq ft for veg and 30-50w per sq ft for flowering.im not sure how that would translate to meters.dont overlook the quantum boards for these builds also.the qb 98 and 120 are great for veg and those qb288 back in stock are kickass for flowering :)