I tried Ati blue plus,purple plus,coral plus with Ati actinics and could never get a look I like ,,it was always too blue or white..not a kind "crispness" to the tank..
Just recently I switched to Geisemann bulbs with no purple bulb and like what I see,,i experiemnted with Geisemann actinics but tried the old Ati ones and liked the appearance better..so I just ordered 2 Ati acts with all Giesmanns for the other bulbs,,no purple bulb at all..
Only time will really tell about the growth topic,,both manufacturer have great products but it just a personal preference..