I just built my first mod out of a Kobalt flashlight and it looks super sweet (kinda like a light saber). Unfortunately it is running 2 CR123's and I'm assuming that means it's hitting about 7.4 volts (3.7+3.7). Does anyone know what size of resistor I need to bring it down to 5v? It seems like the unregulated voltage would be a little too much and possibly dangerous. I usually run Boge 1.8 ohm carto's on it.