You can veg probably 8 very happily under the available par you have, but for flowering 2 will do just fine, what you have to remember is you have "600w" but split across 3 lights, so having just a single plant under that many lights is just wasteful, unless you want to go through the anguish of mounting and angling lights anyway.
So veg 6, go darwin on their ass and pick the 2 strongest, bin the other 4 and happy budding
Bookmarks