Check out the Fenix L2D Premium. It provides regulated 180 lumens for 2.4 hours on 2AAs. But it does give 12 lumens for 55 hours!
But the days of unregulated, 20 minute runtimes are over for me! Surefire, RIP!
+1 on Fenix. I've retired my Surefire to backup status. I bought the premium Fenix 1xAAA, the 1xAA and the 2xAA body which uses the same head. Around $100, IRRC, for a very versatile and reliable set of lights that meet all of my on-duty and off-duty needs very well.
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