I Just bought a 400hps light with ballast. I am deciding to buy a metal halide bulb for my vegging. My question is, can I just buy a 400mh bulb to use with the hps ballast? Also, if i'm growing a sog in my 100x100x1.8 tent, would 9 plants be okay with the 400watt hps? Thx.
Use the 400w Mh ONLY if you have a DIGITAL BALLAST, as they go both Mh and HPS, don't try this otherwize. 1.0m x 1.0m x 1.8m = Yes better with 600w but will do 9 plants well, use a fan and a vent
Okay. Thank you both for the reply. From looking back on my order I don't think I have digital ballast. So I would to save some money without having to buy a new ballast, i'll have to invest in an conversion bulb. One question... What the heck is a conversion bulb?
I've heard using hps for both cycles is okay also. However, since it's my first ever grow, I thought I'd go set up the way i've researched to experiment how it should be properly done. Again thx for all the help.
I have a 400w HPS ballast running a 400w MH bulb..over a year now with no problems.You cannot run an HPS bulb in a MH ballast though.