That looks like a cool project. I currently use SOLA lights, which have a locline mount, so having a way to adapt that would be useful to some of us. I'm not sure that 1% increments are really necessary, but something like 110% increments might be. Battery life is one of the big issues, of course. Any idea what the life of the various battery options that you mentioned would be? Please keep us in the loop, I suspect that there are more than a few people here who would be interested in lights like this.