i would like to build a small helmet light mostly for reading my cue sheet while navigating. It would be nice to be able to put it on high for oncoming drivers that don't dim their lights. Since you can get down to 10mm with suitable optics, I went looking for a driver that size. Seems like all the small drivers on DX are perennially back ordered. Anyone know of a 12mm or smaller driver that would work for this? I've thought about remoting the driver with the batteries, but it seems better to get a small driver and put it with the led.