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!

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

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