Ultrafire c8 battery options

I have an xm-l t6 ultrafire c8.. Does anyone know if it is safe to use 2x cr123a rechargeables in it. And if I were to be able to use cr123a batteries, then would there be noticeably more light, or lumens emitting? Thanks

only use 18650's..you'll burn the driver using anything else..

Good to know. Thanks for helping me figure that out .

no problem..