The Lumintop FW3A is the result of two years of development on enthusiast forums BLF and TLF. It's one of the smallest 18650 flashlights, with three emitters, a tail e-switch, an open source firmware, and a firestarting 2800+ lumen burst mode. It already offers four LED options, with more to come, has great ergonomics, a fantastic user intefrace, optics that are nearly as easy to change as the battery, and no glue anywhere. Did I mention it's under $40? It's under $40.