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The electronic controller besides looking really cool (cannot upload pics - any advice??) is a pulse width modulator, which allows for lowering the current with near perfect efficiency.
So really only advantage with batteries. Old style POT switches that still allow you to adjust the heat waste a heap of power, so better off either being on/off only - no adjuster.
Production: the thought did cross my mind. The one's from the states are expensive, really expensive.
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