Metal Halide ??

Discussion in 'First Time Marijuana Growers' started by blanchdave, Dec 15, 2007.

  1. I just got a big light (for free) from a job i was working at.
    I think its metal halide (big square thing with glass cover, big bulb and reflector.
    The bulb says Phillips HPI-T Plus 400w.

    Can any1 give me some info on these ?
    are they good for growing and at what stage ?
    do they produce much heat ?
    are they expensive to run ?

    Thanks !!! :cool:
     
  2. Use the metal halide lamps during vegatative growth. And whether it is expensive to run depends on how many plants are vegging. If you are just vegging one CFLs would be more cost effective for veg growth.
     
  3. make sure its a MH and not a halogen(halogens wont grow plants). and sacred herb said everything else heh, o and ya 400 watts prolly gonna get some heat generating so make sure to have a good vent system.

    EDIT: ya i actually searched the bulb name it is a MH bulb so ur good to go.
     
  4. thanks for quick reply..... how far should they be kept from plants ?
     
  5. 12-18 inches i believe but youd be better off searching the forums and finding the nifty light distance guide or something liek it around or check some grow journals that have been using 400 watt MH.
     
  6. Here is the chart... use it wisely..
     

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