Arduino seems like overkill for this purpose. A 555 timer could do the trick for the on - off cycling. As for handling the mains, I would use a triac. Cheap and quiet. Here is a similar post: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1266805390- Scotty
... and just find out which electro-mechanical relay will work
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