They'd be more efficient at 230V since the I^2R losses
would be less with a lower operating current.
You would save watts be having less heating.
R

Olin Lathrop wrote:

> Marc Nicholas wrote:
> 
>> but do you really mean your require less energy overall? (i.e.
>> Watts).
> 
> 
> Hopefully not, since Watts is a unit of power, not energy.
> 
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