I am running a 600w Nebula, same as Apollo, ballast and buld that i got on ebay. So far i am happy with it and i have done nearly 1 full flowering with it and no issue. Production is looking good. Yes the bulbs are not top quality that is for sure and a quality bulb like Hortilux, Ushio, Digilux ect. After a few grows i will be replacing my hps bulb with a better one.