Do not be mistaken, the E1 is extremely bright for its size. Compared to my Mini-Mag 2AA it is probably brighter. That is really quite amazing for a light that tiny.
Plus, the beam quality of the E1 and other SureFire lights cannot be overstated. A flawless, even beam is much more helpful in illuminating objects and for other general uses. When comparing my E1 to my Mini-Mag the beam pattern is the where the E1 really shines
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I use my E1 for everyday carry (until my E2 arrives) and I have really never needed a brighter light. The E1 is great because you could get away with having only the E1 in almost any situation. Even if you were camping in the woods, if you had to make-do with the E1, you could. Sure, a (2) 123A light would be much better, but you would not be too badly off with the E1.
If you do not have an E1, you should really purchase one. Of all the people who have posted regarding the E1, I do not recall anyone who has not been pleased with the light.
Bucky