Don't worry about the mh bulb, hps will work fine. Go ahead and use the 600, the plants will love it.hey ive been vegging under 2 2 light 4' t-8 and a bunch of cfls 6500k. i just got a 600 watt hps. witch would work better for veg? should i just keep useing the flouros till flower or will the hps work better . no money for mh convertion bulb. thanx guys.
Agreed. Although it is the right color temp for vegging lumen output just cannot match the HPS.Don't worry about the mh bulb, hps will work fine. Go ahead and use the 600, the plants will love it.