Most nixie controller circuits don't use that much power, most of the power is 
used from the high voltage to light the displays.  This modified wall adapter 
technique actually delivers more usable power for a given adapter power because 
the adapter efficieny is about 80% but if you take the low voltage and boost it 
up to the high voltage, that converter is also about 80% efficient.  This means 
that the nixie power is delivered at 80% x 80% or 64% efficiency.

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