250 watt HQI ballast.

[StirCrazy]

Originally Posted by ron101

Overall power draw on the circuit is voltage x amperage; which should remain the same for both a 110 and a 220v setup. However power lost to heat is [correction : resistance x current squared] .[/i]

Ron, you realize thoes are both formula to figure out the same thing.. the second one assumes you don't know the voltage, and the first one assumes you don't know the resistance of the load.

so both will give you the total power consumed by a load and if you know all the factors and do it both ways you should come up with a number that is very close to the other.

Steve