I was thinking about adding one more taillight to my commuting setup on my helmet, in addition to the two PBSFs mounted on the rack. A helmet light would be helpful for a few places on my commute where cars may not notice the lower lights . . . mostly for right hook avoidance where overtaking cars cross the MUPs.

My helmet headlight already adds some weight, so a low weight taillight would be great. Also, easy mounting is important. Brightness is not critical, and USB rechargeable would be good, but not absolutely necessary. Any suggestions? I have an LG vented helmet.