It seems quite a bit brighter to me than than a 3-C halogen or xenon bulb, I am thinking specifically of a Scout that a buddy of mine had.
The sealed bulb unit itself looks like it would just drop into any 3-C light, if you need it I can mic it and see what the diameter is. I bought mine from Tech-Blue in NJ, their only US distributor that I know of.
Oh and FWIW the light has the same affinity for Duracells that the cannon does, I tried using Energizers and it wouldn't work at all. The Duracells have a wider surface area at the base/negative terminal and the internal conduit that runs down the inside of the light terminates in a largish circle at the inside base. Odd.