I have wondered about this issue to. I have a 4AA Xeneon Streamlight that has the most uniform, 6P like beam I have ever seen. I bought a 3C Xenon Streamlight after this experience. The 3C had the most ratty laser like beam; NO side spill; that I have ever seen. I switched factory bulbs on the 3C, and lo and behold, now I have a Mag-lite large ringy beam. Go figure.
I do NOT like paying for a $$$ complete assembly, but maybe they know what they do.
CPF has been so much fun; I have loved lights all my life, but this is well; costing me a lot of money.
Can't wait for the Streamlight Task Lights !!! Y'all go ahead and pay that Surefire price. I'll be happy as a clam.