So I have been reading that the new SF E1L-A (90 lumen is out). My real confusion is this: I own a few E1L's with the KX1B head (80 lumen). I also own a few E1B's (110 lumen). So with the two different lights I own and the new SF out, what is the purpose of owning all three lights. Don't get me wrong I have the new E1L-A light coming to my office this week, but why? What different scenarios or applications would arise that I would need 3 different lights to handle issues. What is the big difference in the lights, I know the E1l is low the high, E1B - high then low. But what are the other reasons I should own them all, thanks!