Brad-alike, I just put one in my Arc LSHP (new version w/legs) and what a transformation. If this was available way back when, the Arc 4+ might not have been necessary for a while longer. Similar beam with slightly dimmer but also slightly bigger hotspot, and way better than the original beam. I believe you can use the TC (tuna can) one as well, just trim the skirt high enough to clear the soldering and wiring, etc., on the Arc's Star.