Phillips does make a 2.4 v 0.8 A lamp in a PR style.
Mine are marked Phillips HPX21 and they throw a very tight hot spot with wide spill when installed in a 2 D Maglight. I figured with the XPR103 "upgrade" for 3D's so popular, this would work similarly in a 2D, and it did.
I'm also using a KR2.4V 0.9A pr style lamp in my Sear 3AAA LED leftover body, and it is pretty nice. ETA: radioshack p/n 272-1157 is the KPR102, rated 2.4 v at 0.9 A. kills the 3aaa's fast, but is impressive when they are fresh.
Check at Radio Shack for lamps. Also good hardware stores (not Lowes/Home depot) like Ace sometimes have the Phillips lamps. I don't recall exactly where I came up with the pair. Does anyone think the Phillips HPX21 rated 2.4 v. 0.8 A MIGHT survive in a 3D? HTH.
Paladin