its my 3rd grow but whats better 4 x 150w hps or 1 x 600w hps because im using 3 x 150w hps and just wondered shall i get one more 150w hps to make 600w or just get a 600w hps. even if i put 1 more 150w hps i will still have no problems with heat as i have got that sorted with a lot of tinkering with my equipment witch was stress full but i got their in the end...3 auto ak 47 and one road runner and iv got 3 sweet dwarf germinating as well the big ak 47 is on day 34 and day 21 sexing and going good im going to know Wat the pro growers say wen you get a feel fore your plants knowing Wat they want witch makes growing a lot better and easier to grow