The 2x123 (downboy) version will run on inputs 10V or higher and two RCR123s are no problem for the Downboy. We have the A19 UV head built out as a 2X123 with a Downboy and a Nexgen 1X123. The head is available separately with a Wizard 520 driver which will run on an E1, E2, Aleph 1X, 1.5X, 2X power pack and all 1, 2 cell Surefire E series power packs making the Wizard A19 head a nice addition too your arsenal.
The A19 reflector is very friendly with both Cree and Luxeon LEDs.
Some testing with the LuxV and spacing the reflector off a small amount produces one of the nicest beams from a 5W. I think Don did some testing with the 5W.
Sorry, I didn't see this post sooner.
Thanks for moving the thread.
Wayne