The XT11 has been upgraded to a higher output, more efficient LED as well as some other small changes. This is the original XT11, which is no longer being made. We have the new Klarus XT11 with the XM-L2 LED available if you want the latest version.
The Klarus XT10 was supremely popular due to its high quality, great beam, and innovative interface. Some customers asked for something a little nicer, so Klarus came up with the XT11. The XT11 uses the same fantastic dual switch interface as the other Klarus XT lights, but adds a stainless steel bezel for increased protection and a max output of 600 lumens. The XT11 also has two springs in the battery tube for even better shock absorption when weapon mounting the light.