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I have this crazy physics friend that decided to make a plasma speaker on his own. He had a mosfet that was able to source RIDICULOUS amounts of current. He had at least 150W going through this mosfet. He was able to run his lightning arc for several minutes straight, the whole time without exceeding the max temperature of the mosfet. Now, I wouldn’t recommend doing this (we got burnt on the heat sink, but the $12 mosfet was ok so its all good), but this is a durable highly effective heat sink!