I have tried to build a cirquit with a the arduinooard on one side of a IRL540 mosfet, and the halogenspot and a transformator on the other side, i cant make it work. The halogenspot is a 12V 50W spot.
You would need something like the all-mighty radioshack reed relay or even better a solid state relay and then you could choose to switch either the low(er) voltage power coming out of the halogen's xformer or to switch the 120v xformer itself.
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