Hmm some people have bought those fixtures. But not me. lol
If you were gonna go MH
I'd go with 2 250w, then theres no room for not enough light. But MH
comes with their own set of potential negatives. Bulbs are pricey, draws more electricity by some and might require a chiller, but you won't know for certain about the3 chiller til later.
That could be a maybe item.