Using LED\'s for rear lights help....... I'm looking for a way to "build my own" LED tail lights, I'm not sure of how one would go about this.Does radio shack sell different kinds of "boards to use for this"? \i've looked at the parts express catalog, and they list 3-4 LED's, but it saysruns off of 3-5vdc.Our trucks and blazers are 12 vdc, do you have to have a voltage reducer or is this just the amount of power they use? I'm guesing that you put a "bright" and regular LED's in board to get a turn signal? I'd like to build some of these,but need some ideas and help.Thanks.