hello there, i've been holding back on buying a surefire for quite sometime and it's due to the short runtimes. i read that certain surefire models can be changed from incandescent to LED. i currently own a L6 and i was wondering if there was a cree drop in for it? preferably a cree Q5. one other question is, is there a turbo head for the L6? i was told that the M3 and the L6 are similar in design but the M3 just throws further and can have a turbo head. would it also be possible to use a cree drop in for an M3? thanks for any help!