Guys, I can't decide! I gotta choose between a 150w hps or 250w hps. My place is 60x60x180 (cm). Which should I choose? I wont have a cooltube.. and I'm planning on growing like 4 plants. No more, no less. Help is much appreciated!
A 250 will give you around 65wpsf and a 150 less than 40wpsf. If you go with the 150HPS, you might want some supplemental (cfl, etc) lighting.