question on 120volt-240v switchable circuit ballast vs. strictly 240 volt ballast

I was looking at the Lumatek E-Ballast and wanted to know the general difference between a 120v and 240v.

Now I know that with 600 watts at 120 volts is 5 amps and that 600 at 240v is 2.5 amps.

From my understanding it means this.

If an amp is a measure of electrons passing at a given moment, then the higher ampere choice(120v) will have more electrons flowing through a smaller pathway, as compared to 240v; and more of a chance to release this electricity in the form of heat on it's way to the filament to light the bulb. That means a decrease in efficiency.

While the 240v is giving the electrons a BIG pathway to flow on, or has higher conductivity, and thus allowing more electrons to move at a lower rate/unit time, which in the end increases efficiency because less energy is lost in the form of heat in the transfer...

Am I anywhere near right? IF NOT PLEASE CORRECT ME

In the end my question is, does a switchable 120v/240v have less efficiency than a purely 240v ballast? or are they just saying that to get me to buy it....
 
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