Fenix makes the L2D in single AA. They also sell just the body tube. IIRC its about $12 for the body. Its about the same diameter as the Infinity before Gerber got hold of the design & a little longer. It will handle the job of both of the other two and also replace a Surefire E2 on normal high. Run time for the L1 is advertised as 25 hrs on low.