I used red cree LEDs and green cree LEDs. The red ones had a forward voltage of 2.7V so I used a 3.3V UBEC along with one 1n4007 diode in series. For the green, they wanted 3.2v so I used the same 3.3V UBEC and just tapped off before the diode. Sorry, no pics on hand but works well and saves...