I am new to the flashlight world, and am trying to learn all I can and get up to speed. I have been lurking here for a little while. Here is my question: I am looking at buying a EDC (LED) light. I am torn between the E1B / NDI / and JetBeam Pro 1. Could you guys help me understand the things to consider? What are the advantages of the CR123 batteries (E1B) over the normal aa and aaa? What about how to switch between all the modes? Thank you in advance for your opinions because they are driven by much more "real" experience than I have.