I think the old Lux version was rated at 60 or 80 lumens, where the newer SSC P4 was rated for 120, then later on 170 lumens (I don't think there was a change in output, just the rating).
For what it's worth, I didn't really care for the Lux version. Warmed up way too quickly, and didn't put out all that much light. For my money (on a 2 cell setup) I would want a SSC version modded with your choice of LED. I had a newest version L4 that was nice and bright, didn't get warm too quickly, but the tint was pretty bad (like the P60L). If you could fix the LED, you wouldn't need to mess w/ the driver.
Just my .02.