Well, since no one else is jumping in, I'll give it a try. First the obvious - don't use it as much.
Seriously, something like an Arc, PT Blast, UKE 2AAA, etc. will travel almost unnoticed in your pocket and will let you save those lithiums for the important work.
Second, use the MN15 lamp and stay away from the MN16. If you're not using the light in a "tactical" role I have never been very fond of the run-time trade-off with the SF high-current lamps.
Third, if you don't need that much light, try an 6V N1 lamp and a battery spacer. This should give 65 lumens for an hour with only 2 batteries - like a 6P with a tighter beam. I don't have an M3T to try this myself, but I know the N1 will fit where the N2 will, and the M3T was extensively tested with the N2, so everything ought to work. Just remember to use the battery spacer to avoid the flashbulb effect.
Fourth, if you don't mind what the end result looks like, you should be able to combine the N1 lamp with the battery and short extention tube that is used to convert a 9P to a 6R to end up with the world's first "M2RT" (?). Frankly, I would probably just by an Ultrastinger before I went to all the fuss. Which, of course, leads to...
Fifth, buy an Ultrastinger, and save the M3T for when you really need a waterproof light with a tail switch and "combat" grip.
Hope this helps - welcome aboard!
BCK
