1. Dont ever put the wrong voltage plug into the wrong adapter.... Easy way to start a fire.

Ultimatly at the end of the day, all power gets back to Watts.

Voltate is the measurement of electric potential
Amps are the measurement of electric force
Watts are the measurement of electric power

Easy formula Volts*Amps = Watts

On a 120 Volt system, to power a device using 600 Watts (like a light bulb) you need to use 5 Amps of power. On a 240 Volt system, to power the same 600 Watt device you only need 2.5 Amps of power.

At the end of the day, on either set you are drawing 600 Watts of power.

In America, our common power is 120Volt and most of the time, your circuit in your house (the series of electrical outlets that go back to your circuit breaker) are going to be limited to 15 Amps of power. This allows you to have 1800 Watts of power on the system (and is why when you use heating devices like your toaster and microwave at the same time your breakers pop.)

The only reason to use a 240 Volt system is if you are using a VERY high power device (Electric Dryer, Electric Range/Oven). OR if you were using a 3600 Watt device (or say 6 600 watt lights)
ddxsinxcosxdx Reviewed by ddxsinxcosxdx on . ballast 120 240v ello' i was wondering what the main difference is when a ballast is wired at 120v vs 240v. say on a 400w or 600w hps Rating: 5