Couple ?'s

Discussion in 'Growing Marijuana Indoors' started by Leafsfan81, Aug 6, 2007.

  1. OK, I wanna switch from CFL's to a 400W metal halide, should have it soon, but I'm also waiting on some white widow seeds, but how much heat does a 400W MH produce? What is a safe distance between the light and the plant? I imagine it's much different than when using CFL's. Just wanted to get it straight before I begin. And how many plants could I grow simultaneously with 400W?
  2. quite a bit of heat if ur using a small room i would sugest a euro reflector and an inline fan to cool ur lamp but if thats not an option be sure to keep a fan on the light and the room well ventalated - rule of thumb is 100 watts per plant and u can keep ur light - if cooled well- u can keep ur light about 8-10 inches away or as close to the light as u can put ur hand....just adujust and check the lights hight to control temperature and watch to make sure u do not burn them
  3. Cool, thanks bro.

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