I'm looking for an inexpensive 1xRCR123 host that I can use P60 modules in. I will likely put an MC-E or P7 in it and drill a hole in the side so I can use an external battery pack on my bike. Any suggestions?
I've run several configurations for bike headlights. My current favorite is an MC-E.
This setup is power hungry and will burn through RCR123's like crazy. If dual use pocketability is not critical, you may be happier with a larger battery setup. The L2, for example, will run 18650's. The complete light will be about 50% longer, but offer well well beyond double the runtime.
If stability is a concern, the bigger twofish mounts I use easily handle a pair of 26500 cells.