In a nutshell:
2. Battery confusion AA vs CR123. Some lights accept either one. Others not. Obviously each battery type has its strengths and weaknesses, but what are they? Also, for my purposes does it make sense to use rechargables or disposables?
Lockblocks will be oriented wrong (perpendicular) for a stem-mount, however Twofish has a similar product that would work. Bikeblocks? I can't remember what they call it.
3. My road bar mounting sites are already used by a computer and a "be-seen" cateye light. I would like to mount the flashlight(s) on my stem (it's an old fashloned quill stem with about 3 inches showing....anyone have experience with this? Will the lockblock or other "handlebar" mounts work on a stem?
R&D time, plus being conservative and playing "wait and see" just in case a better emitter comes along. For example, when the K2's came out, they were great, but Seouls and Crees came right on their heels with more efficiency. On the flipside, Rebels looked promising, but couldn't live up to their promise because of production issues.
4. This one is more philosophical....if the technology for high-powered LED flashlights is so good and (relatively) inexpensive, why haven't the bike light manufacturers caught on and modified it for bike-specific lights??