how many amps for a 400 watt light

Discussion in 'Indoor Growing' started by videoman40, Jan 16, 2007.

  1.  
    videoman40

    videoman40 Well-Known Member

    how many amps does a 400 watt light use, the reason I am asking I was wondering if I could place two on a typical 110 volt outlet, which is usually like 15 amps I believe?
    Peace! :joint:
     
  2.  
    dursky

    dursky Well-Known Member

    good question
     
  3.  
    MightyBuddha

    MightyBuddha Well-Known Member

    Don't quote me but I think I read somewhere that a 400W lamp uses like 7.5 amps.
     
  4.  
    le1337need

    le1337need Well-Known Member

    wouldn't the ballast say how many it uses?
     
  5.  
    potroast

    potroast Uses the Rollitup profile Staff Member

    The formula is Amps = watts / volts.

    So your 400w lamp, plus 100w for the ballast totals 500w / 110v = 4.55 amps.

    You could put 2 on a 15 amp circuit, and have several amps to use for fans.

    HTH :mrgreen:
     
  6.  
    videoman40

    videoman40 Well-Known Member

    Onece again, thanks potroast!
     
  7.  
    nongreenthumb

    nongreenthumb Well-Known Member

    you can get a six socket relay to power upto 6 600w lighting combos, this is 23 amps.
     

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