As I do not have a SL PP 4AA Lux I can not make a direct comparison to my Gerber LX 3.0. But as I've said in previous posts, I think that the LX3 is a fine flashlight.
I bought mine BST NIB to replace my broken SL Jr. Lux. The LX3 simply outclasses the Junior in every way - stronger spot, more and brighter spill, brighter overall at 45-50 lumens and with no feeble Kroll clickie and no regulation, the LX3 is a simpler device with fewer potential points of failure. With NiMH batts, regulation is a non issue. In emergency situations where long life is needed, alkalines provide excellent initial brightness with a long discharge tail. I get several hours of very good brightness on a set of charged NiMH batts.
While the LX3 may not be the thrower that the 3000 lux SL PP Lux is, at about 1000 lux, at modest range its not too bad. With its effective spot and very bright spill, the LX3 creates a "dome" of light in front of the user. While the warm tone of my LX3 skews white a bit goldish, its ability to render, particularly, organic colors, reds, browns, greens, yellows etc., rivals incans. The X1 tint along with that "dome" of light makes my LX3 a SUPERB outdoor flashlight. And at 50 or so lumens along with its bright spill, it does a heck of a job indoors too. With its flat "bottom" the LX3 can stand on end and is a very good ceiling bounce flashlight. With its inline heavy duty aluminum tube form and powdered finish I think that the LX3 is a better looking flashlight than the SL PP. It has sort of an industrial deco look with its fluted bezel and tail and flat sides. If the situation should arise, I am certain that the LX3 would make for a pretty fair head knocker too.
73
dim