Join Date: Apr 2008
Location: The Northwet, U.S.
How do you plan to create the appropriate difference in brightness between tail lights and brake lights?
If you're using the same LEDs for both, you need more than a switching device; you will have to do some work with resistors and a soldering iron.
I built mine from scratch, modifying my original Givi incandescent lamps, and I spent quite a bit of time finding LEDs of the right brightness. I ended up buying LEDs that were bright enough for brakes, and then cutting their power back for tail light duty. I never got around to having them switch automatically; I just use them for tail lights. If I were motivated to follow Greywolf's advice above, I could get faintsy with 'em like you want to.