Yes, it can be replaced with a clear lens, but I have yet to find one. Anyone know were to get one. It is nice, fits tight and gives you the hex-head anti roll profile. But I don't know were to get a clear lens for it.
Anyway, the beamshaper lens does diffuse the beam very nicely, giving you a more "nichia" type LED effect for those who don't like the narrow beam angle of the LS. And maybe more importantly, I clears up most of the "tint" issues, producting a very white looking light, much nicer than my E1 w/beamshaper (too yellow!).
Lonewolf,
It's a CRKT PECK, they also make a larger version called a KISS.
It's very streamline and pocketable. I just started wearing it again since I added the LS to my keys. It also has a pocket clip on the other side.