Ok so from what I can gather running things on 240v draws less amps from the main breaker.

for example, a device that draws 120volts will draw 2 amp, to the same device that could draw 240v @ 1 amp...

YES it is the exact same amount of electricity in the short run, but this means

basically you can run more 1000 watt lights from one breaker...

heres where the saving come into play...

240volt will run your equipment "cooler" prolonging the life of it because it is drawing less amps, and in ballasts this means less Electricity draw over the life of the ballast.

ESPECIALLY in electronic digital ballasts which compensate with drawing more electricity as the bulb life goes on...

So in essencse it does save electricty for people who are running 5000+ watts...