Hello peide01!!!
Welcome to CPF!!!
This is going to be a neat experience for you....
If you buy ANY of the lights being discussed here, I can almost guarantee your Stinger XP will very quickly become your "backup" light, you'll find the compact size and higher output of these options very attractive
The Stinger XP is about a 6 watt xenon lamp assembly, good for around 100 torch lumens. (depending on how and when you measure)
Most of the stuff being tossed around here as ideas (The TK11, MalkOff M60 in a SF host, DereeLight CL1H, etc etc) are all going to probably spank the Stinger for output and even runtime, while doing it in a smaller package.
I agree with others though, don't bother with the SureFire 6PLED model. It's one of the dimmest "modern" LED lights of this size class in this price range. The 6P would be better used as a host for a different module, in which case, you just buy the basic incan model and upgrade it.
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One point I'd like to bring up here, as you may have noticed, there is some strong argument for a Fenix TK10/11, and then the alternative SureFire with a MalkOfff drop-in.
The Argument for the TK11 is 18650 compatibility, multi-mode, good grip, etc.
The argument for the 2 cell SF with MalkOff M60 is upgrade-ability with future tech.
There are certainly other points being made for both lights, but with all things considered, I'm of the belief that the best of both of these options can be combined in totally different options....
A Wolf-Eyes 6 series LED light, (there are several options with different body styles etc etc), or a DereeLight CL1H. Both will operate on an 18650 cell like the Fenix, and both have the option to replace the LED module when technology improves. The DereeLight even has the ability to replace just the "pill" that the LED is mounted to, making upgrades even more cost effective. The Wolf-Eyes modules are buck-regulated, and will run with diminishing output like the TK11, and are available in single mode and multi-mode flavors, While Dereelight has a number of different module types available to meet your mode and battery requirements.
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I think in the end, the best option boils down to a few major issues:
Single or Multi-mode?
Rechargeable or CR123 primary?
Price range?
Throw or Flood oriented beam?
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Eric