This is a where a Power Mosfet comes in. With the help of the Power Mosfet, we can use the low voltage output from the Arduino ports to control high voltage/current loads -the popular “12V LED strips” ...

The idea is to be able to effectively control the brightness ... I have a couple of them in stock. Using an IRFZ44N, I made a simple LED driver and used an Arduino Uno directly.

[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 ...

Using motion detectors and an Arduino you can trigger lights, fans, or even an pneumatically controlled cleaver-wielding ... flash the on-board LED in front of digital pin 13.