how many amps for a 400 watt light

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

  1.  
    videoman40

    videoman40 New 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 New 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.
  8.  
    Ar1$t[]cr@t$

    Ar1$t[]cr@t$ Active Member

    but remeber thats max wattage 400 it wil only use that on startup then it will drop down to like 220watts so it will be even using lets amperage so no worries..late ar1

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