Basic info about a LED PWM "dimmer" circuit at ~3amps

Using Arduino Project Guidance
3

Hi, Maybe look at the Arduino Power control page on the ArduinoInfo.Info WIKI:

http://arduino-info.wikispaces.com/ArduinoPower
scroll down a ways to here:
http://arduino-info.wikispaces.com/ArduinoPower#DC

and you will see an example of controlling/dimming multiple Amps of lights (could be LEDs). Example code there too.