Primary: either Jetbeam Jet III Pro ST or Jetbeam Pro Military, both use 18650 cells.
Jet III Pro ST:
-runtime on max using Trustfire 2500 mAh protected 1850 cell: 1hr 48 minutes (+/- 3 minutes as i wasnt watching the clock all that closely)
- 3 programable modes using the IBS so you can set the light levels to whatever you want from low to max and even the frequency of the strobe
- operates using a forward clicky, 1/2 press to have momentary light and to switch modes, full press for constant on in the selected mode
- good build quality, feels great in your hand
- understand that it can be fitted with a strike bezel (if that is a concern)
Jet III Pro Military
- as above except that it only has 2 modes, default is max, 2nd mode is user programable using the IBS.
Many reviews available here on this site and
here
And the Jetbeams are available at
this site
hope this helps.
p.s. i didnt suggest a secondary cos i would probably just suggest getting either spare cells or something as the Jetbeam (esp the Jet III Pro ST suits all my needs, can have a really low low mode to a disorienting strobe) at most i would suggest a AAA keychain light like the L0D or something similar)