RE: comparing the E2L & the E1L
Both use the same emitter & same smooth reflector in the KX2 head, so the beam pattern is identical as far as I can tell. According to the specs, the E2L has higher lumen output, but 20' beamshots against a white wall show almost no difference.
IMO, the advantage of the E2L is longer runtime. And the E2L has the long clip which is much easier for me to use. That said, the E1L will probably see more use than I planned. It's too nice to toss in the Harley bag, most likely it will go in my tool pouch, where the small size will hardly be noticed.