The GR-USA C-8 uses a boost regulator to power the CREE P4 XR-E emitter from either a standard AA 1.5v battery a rechargeable Ni-MH 1.2v battery or a Li-ion 14500 3.7v battery. 

This light is very sturdy, well built for rough daily use. The removable pocket clip is very functional and oring seals make it water resistant. The battery is held solidly in place with double spings, one on the driver board and one on the tail cap.

The C-8 comes with a pointed bezel, I did not particularly like this feature so I also offer it with a smooth bezel (see images for details). If you prefer the smooth bezel please be sure to select it in the options below. 

Performance:

Li-ion:  135 lumen high /20 lumen low
AA:  55 lumen high / 20 lumen low