AggiePhil, I currently carry on my duty belt:
- Pila GL3, with white/blue tail-cap LED and 3 Powerizer RCR123A 3.6 v li-ion rechargeable cells, in a black web nylon Stinger/Polystinger holster;
- MXDL 3 AAA 3 watt LED, with alkaline batteries, in a black basket weave leather OC spray canister holster.
I will eventually replace the MXDL with:
- LED Logic Striker VG, with 2 Powerizer RCR123A 3.0 v li-ion rechargeable cells, in a black web nylon Striker holster.
I have 2 sets of cells for each of the GL3 and VG, and both chargers have both AC & DC cords, so I should NEVER be without a light. I now work 10 hour shifts, which often turn into 12 or 14 hours, and mostly work nights, so I need light (I am kind of afraid of the dark).
I also carry the following in a tool box in the trunk of my patrol vehicle:
- no-name 1 million candle power rechargeable spot light;
- Pelican M6 xenon, with 2 x 123A li batteries;
- 3 Dorcy 2 D 9" LED traffic wands;
- Mag-lite 3 C, with TerraLux 3 watt LED module;
- Mag-lite 3 C, with Nite-Ize 2 to 6 C or D LED bulb;
- Mag-lite 2 C, with borofloat lens, KPR118 bulb, MOP cammed reflector and 3 Powerizer RCR123A 3.6 v li-ion rechargeable cells.
One of my partners is evaluating my VG to consider ordering one, a 2nd is evaluating my 2 C to possibly buy it, a 3rd is evaluating my 3 C with TL module to see if they want to buy a module or the whole light, and a 4th is thinking about buying my P M6. The 3 C with N-I LED is not as bright as the MXDL.
4 Powerizer RCR123A 3.6 v li-ion rechargeable cells will power up a KPR144 bulb, but not impressively. I am waiting for some Mag-lite LWSA601 bulbs, and may get some Mag-lite LMSA601 bulbs, to try to over-drive in one of my 3 C, as the KPR118 are not lasting too long with 3 x 18500 or 4 Powerizer RCR123A 3.6 v li-ion rechargeable cells.
I would suggest choosing something no bigger/heavier than a 3 C, but am waiting to try out the Tigerlight in the passaround. You may want to consider Pila or Wolf-Eyes for incandescent lights, the Striker (if you have some money), Night-Ops Gladius (if you have LOTS of money) or the MXDL (not much money) for LED.