I have some 3mm pre-wired LEDs for car projects. The LEDs come wired with a resistor and which is covered with a heat shrink. The specs for it says supply 12v for max brightness and 5v for dim. I want to run these LEDs in dim brightness from a 12v power source directly from the car. But ideally don't want to have to use some sort of 12v to 5v convertor. Is there a way to add another resistor to turn the input voltage from 12v to 5v?