hps very effective...but moneys tight here right now...experimenting with other light sources...
cant touch hps here for less than $70.00(secutity light conversion) parts for conversion not included(rewiring needed) ... for $40.00 I can get 2 red spec & 2 cool white tube fluorescents plus the fixtures..with cash left to buy a pack of papers...lol.
I will also mention I am aiming to grow in a cabinet system....400hps is about the max I could use without roasting my plants... gotta watch hps in small spaces....anyway...peace