My E1L has KX head while E2L AA has KX1B head. These heads provide exactly the same brightness so I doubt that it really matters.
Hi Patric, my friend. How are you?
I just got another E1L (old model) because Surefire stopped produce them, and it´s the best light ever, IMHO.
I EDC a E1L with the "old" KX1 head. In the package it says 45 lumens on high, and I bought it in 2009.
After that I got one E2L-AA, with the KX1B head. It has 80 lumens on high, according to Surefire.
Last week I got a brand new E1L, with the "new" KX1B head. In the package it says 45 lumens on high, like the previous model.
For my eye, all of them have exactly the same output in high mode. The only difference I can see it´s the last E1L (with KX1B) has a little greenish tint in low mode, but just a little.
I think all have 80 lumens in high mode. Surefire just underrated the previous E1L with the "45 lumens" thing. Or maybe it´s an effect of the TIR lens, I don´t know...