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If the device you are trying to reduce watts in is not fluorescent and not mechanical (a fan or motor, for example) use a light dimmer. If the device is motorized, try a variac transformer (just type "variac" on eBay and you'll find them).

You decrease watts by reducing one of the two components that make up the formula W = I x E. e.g. 1000 = 10 x 100, 500 = 10 x 50, 500 = 5 x 100.

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13y ago

What else can I help you with?