Not being self-publicity, but you can see what they are what to do with them here: Essays with TIR lenses on Convoy S2+: XML2 + XPL-HI [Update]
BTW, for AA/14500 flashlights, get Sofirn SF14 (3 modes, no memory) and for the eventually that Windyfire or Efest IMR14500 battery (purple, 2017 version - take a look at Mountain Electronics )