[Help] - How many COBS CXB3590's are advised and more efficient for a 2x2 space?

i think everybody missed that you are on 240v

you can use 1 elg-150-1400mA (240v version and cheaper than the hlg) and run 3 cxb3590s

that will be a sweet 150w set up for your space and is also dimmmable

56% eff and 950 ppfd

buy a tasty 2100 and be done with it.