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[Dario] agrees: he has written a tutorial on building an Arduino-controlled RGB light system that plugs into a standard light socket. [Dario] is using a bulb from Automethion in Italy, an Arduino ...

Arduino controlled Christmas lights! It all started because [Anx2k] had some leftover LED’s from one of his other projects, so he decided to make use of them as permanently mounted Christmas lights.

The entire system is built on the backbone of an Arduino Uno with a few other parts totaling at about $150. That seems expensive, but DeBoisblanc's build covers a lot of ground.