Those are really nice lights. I've been wanting to get the Fenix LD10, i think it uses 1AA battery. I have been wanting to get the Surefire 6P LED light too. I'm not a big tactical light fan, they are superbright, but the runtime sucks on most of them. I try to stick with 1AA and 1AAA lights too, but I do have a few that run on CR123A batteries.