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  #1    
Old 01-16-2007, 04:45 PM
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Default how many amps for a 400 watt light
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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?
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Old 01-16-2007, 04:48 PM
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good question
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Old 01-16-2007, 04:56 PM
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Don't quote me but I think I read somewhere that a 400W lamp uses like 7.5 amps.
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Old 01-16-2007, 07:43 PM
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wouldn't the ballast say how many it uses?
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Old 01-17-2007, 12:20 AM
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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.

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Old 01-17-2007, 06:18 AM
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Onece again, thanks potroast!
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Old 01-17-2007, 06:23 AM
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you can get a six socket relay to power upto 6 600w lighting combos, this is 23 amps.
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Old 01-17-2007, 03:20 PM
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Default yahes right
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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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