[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 ...

[Julian] wanted a way to remotely control various appliances and lights around his house without spending an arm and a leg on home automation. He also desired the ability to easily switch what item… ...

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.