After reading the "Why is Fenix E05/E01 highly regarded as opposed to other AAA lights?" thread I was wondering, what is the longest run time, single illumination setting (no H/M/L/Strobe/SOS/. . ) light in a :
1xAA - configuration
1XAAA - configuration
Seems like it would be hard to beat the E01's 21 hour run time. Does anything beat the Fenix?