The company you're probably thinking of is EverLED. They make a 1W Luxeon, regulated drop-in for any PR-based light. I haven't used one personally, so I can't comment on their worth.
I just did a Mag mod though - put a Luxeon III into a Mag 3D, running direct-drive, 4.5V @ about 1.5A, is driving the LED at about 6+W, and I'll tell ya, that sucker is bright, and throws like a mofo. The Mag reflector is one of the best and can make a pencil beam that throws further than just about any other. I used the "HotLips" heatsinks, which are available for $16 from a user named "Hotbeam" on CPF. It's a simple mod, takes about an hour to do from start to finish.
The throw is on par with my Tigerlight, but with a tighter beam, whiter beam, and less spill. It's also adjustable for flood/spot, and the runtime with 3D's is probably 10+ hours (although I haven't checked this yet).
Have fun!