Primary- Petzl Spelios (Duo 14). I really like the LED array. Max / normal / econo brightness modes.
Maximum 3.5 hours @ 67 lumens
Optimum 10 hours @ 51 lumens
Economic 63 hours @ 30 lumens
I adjusted the reflector on the halogen bulb for max spotlight. Range on the halogen is good, but the light from the bulb looks kind of yellow, dull, and feeble compared to the LED, so I run the LED 99% of the time. I did play with the halogen bulb some on an above ground camping trip, and it seems to drain the battery rather fast.
Waterproof to 5 meters. I've worn this light on three trips to Coldwater Cave. Water levels vary from knee deep to up to my ears. I haven't taken any special effort to keep the light dry, but I can't bring myself to dunk it, either.
Seems like I get better burn time than the specs listed above. Most of my trips are six to eight hours, and I've been flipping to Max more often just to see if I can run down the batteries all the way... hasn't happen yet. Really though, the light from the optimum mode keeps me happy most of the time. My batteries are the ones that came with my BC-900 charger-
http://www.lacrossetechnology.com/900/index.php
or Eneloops.
I've meant to check out some of the options at Custom Duo. Might try to get something more useful installed on the halogen side.