Now that I've completely hijacked this thread (
) I'll show what the results of my testing on the buck modules produced. I bench powered the circuit for HOURS and no heat. So here are the components installed. The pencil marks show where the drop-in vestibule goes and how much room I have. The bare wires from the rectifier are where I'll solder on a two-pin connector about 4" in length so I can remove the shell from the frame if necessary. The second photo is with the vestibule in place, and hiding the circuitry. The LEDs start at about 6V and stay fairly consistent up until 9V where they reach maximum brightness:
Admittedly, a buck booster would be ideal, but this is a good enough substitute.
