Tends to be pretty cold a nights as well...
How about getting feedback from those with experience in theatre doing the same type of role you will be doing?
The feedback I've read is that the G2 is extremely popular for use in Iraq with many soldiers using them as lights for their carbines/rifles etc.
Since aftermarket LED dropins are not supported, and the G2L is pretty new I would advocate having a couple G2's in addition to any LED lights you decide on.
I get a ton of feedback, trust me!
The following lights have failed in Iraq
Inova X5 LED failure due to heat
Streamlight Luxeon Jr. LED failure/switch failure (heat and dust)
Arc AAA-P board failure due to bad batch of transistors
Minimag with BB500 R2H sandwich heat failure
Lights that held up to extensive use. Extensive means used during the day in the heat when working in dark places and running for hours on end at night providing light.
Peak Matterhorn/Killamanjaro white/red/UV lights (lanyard lights)
Mag 2D with MadMax+ and Luxeon R2H mod (used at night to work on projects) Remove head for a great flood light.
Arc AA with NiMH 1.2V rechargable
The lights that worked were used in Iraq and Afghanistan 2004 to 2006 by myself and others.
Next light going under test. Peak First Responder with different reflectors, additional heat sink for the head and two 17500 lithium-ion batteries. Placed used... Iraq by an Army scout. It will head to him in November when I get his address and send the package. The First Responder will replace the Surefire G2, E2E and Streamlight Strion he uses presently.
I will get the light back next summer and mod it with R5 bins and Fraen FRC reflectors and take it with me to ??? (starts with a vowel)
The G2 is a great light... because it is CHEAP! No complaints to pick up a light that bright for $30. HUGE complaints when it comes time to feed the battery eating light though. Life is good when using rechargable cells, having 400 lumens and variable power output.
I don't kick down doors but I do hang up a light in a huge shipping container that needs to be unloaded during the day... in the hot sun... it is painted green... the heat is almost unbearable but it does let me know the heat sinking ability of flashlights. I would not trust a G2 with a drop-in LED to run for two hours in 140F (60C) heat.
The only thing I trust is a light that either adjusts the output down when hot or has enough mass to keep the LED(s) cool. Hell, even a MagLED has thermal adjusting drive levels! Get a MadLED 3D and use it for area lighting... remove the head and it is an awesome flood light.
Still want to see the reviews of the LRI Proton with variable white and red LED output. It would fit well on the body armor loops and runs a single AA. No recommendation until I see a review and the positive contact in the head.
If you need a weapon light, get a Surefire... if you need an EDC for crazy heat/cold and nastiness... get the Novatach.