I use 1000w because I have them but if I were starting from scratch again I would buy the 600w digital ballasts that can run Mh and HPS bulbs. Yes 1000w have more lumens but with the extra heat they put off you loose some of that benefit keeping the light farther away. With 600w you get less heat so you can get them closer to the plants and have just about as much light covering more of the plant area.

does that make any sense?
Zandor Reviewed by Zandor on . HPS 600W VS HPS 1000W Is it really worth the extra $. Will I get A bigger yield with the 1000W ? Does it cover a biger space ? Thanks Rating: 5