if your gonna do it .1 1000 hps per 4-6 veg on a 24 hours of light(youll save a week or more) then 3 1000 on a 8 hours of light cycles doesnt screw with your bills(spiking) and you should pull 3/4 to 1 lb a plant on a northern light or similar. you can use a mh for veg but not nessesary although...