Hey stelthy, I havent checked your grows out in a while but your set-up was bad ass
looked slick like that fighter jet in your av "-)
400w lights would be ok but you would end up buying more ballasts more hoods and more bulbs and end up being more expensive than the 600ds and with less power, your are 100% correct about the light spread though a line must be drawn at some poit... Its just not economically sounf to buy 4- 400w blubs and ballasts and 4 ac hoods when all you need is three 600ds.
trouble- you say you have a place for veg so this will strictly be a bloom room correct?
will you want to harvest the entire room every 2 months or half the room every month?