Well, thanks to the collective knowledge here, I've succeeded w/ my first real mod. After digesting the answers to my earlier post:
https://www.candlepowerforums.com/threads/97815 and doing a little more research, I bit the bullet and went for an nFlex, TV1J, Hotlips, Mag 3D build.
Most of the time was spent modifying the switch to momentary action. The soldering to the nFlex was a bit of a challenge, due to my shakiness, but I got the hang of it.
Once I got everything put back together and fired up, I was initially quite disappointed. No matter how much I messed w/ the menu system, I only seemed to get 2 or 3 dim light levels. Then I remembered that I was using old batteries. I popped in a fresh set and, wow, let there be light! The mag reflector does an amazing job of focusing for throw.
This 1st mod is really an experiment leading up to my ultimate goal of a powerful bar-mounted bike light.
Things I learned from this build:
I CAN handle the soldering necessary for building a bike light.
The Lux III / Mag reflector combo doesn't have as much spill as I'd like.
The nFlex controller is more complicated than I need and would be confusing after no sleep and many many miles of racing.
So, this leads me to my next project. I need more light. Flood'ish, not throw. I'm thinking maybe one Lux V or maybe 3 Lux III's.
I'd like a simpler controller w/ probably 2 levels (high and low). I need flexibility w/ input voltage and regulated output.
I need a way to reduce the package size of the mag body. Maybe cut the body down to a minimum and replace the stock switch w/ a smaller switch. Also, I'll need to build a power jack into the body for external battery packs.
edit: I fogot to mention that I could barely discern a brightness difference between the top 2 levels w/ the nflex. That surprised me and leads me to believe that I may be best off driving whatever led's I use at spec (700ma) and getting a longer runtime.
thanks for any future and past input,
baker