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metal halide to hps ballast

Discussion in 'Lighting' started by sn420, Jan 11, 2013.

  1. 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?


  2. 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
  3. 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?
  4. 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.
  5. 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.

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