I am building a light using five 3w leds. The leds are 3.2v / 700ma and will be used on a 12v car power supply and need to know what resistor, etc i need to reduce the voltage to them. They will be wired in parallel. I have used a led calculator to find the proper resistor but am new to electronics and am not sure if the resistor is all I would need. I don't want to burn out my lights. Thanks for any help.