I have a Fenix L1D from several years ago that is still kicking ass, but I'd like a backup/extra light for stashing in different places, job kit, etc.
When I got the L1D, I had to swap out the tailcap for one from DealExtreme that had click on/off function.
There has to be something like this available now. All I want is a AA light, with at least 100 lumen output, single mode, click on/off tail cap. Simple, right?
The LD12 has several possible modes, but stays where you last set it. It's been my EDC for ~6 months and I have no complaints. I bought two more for Christmas gifts, btw.
It's very handy (and easy) to go to a lower intensity setting when I don't want max output. It's under 100L however, if that's your primary requirement.
For a cheap AA LED, I own several of these that have been in use for the last couple years:
http://www.batteryjunction.com/jetbeam-ba10.html
It is listed as dual output, but the output is bezel controlled. I just turn the bezel tightened down all the way and leave it there, using it as a single output.
4Sevens Quark Tactical AA model. For all intents and purposes it's a single mode LED with a proper momentary/click-on tailcap that put out 100 lumens.
It has other modes but unless you go looking for them, they'll never bother you.
It has a pocket clip that doesn't suck, and for 7 bucks more you get the deep carry clip to bury the thing in your pocket. I ordered a bunch of these for my group at work, and everyone loves them.
Fenix E11?
Streamlight Polytac and Streamlight Protac 1AA
C4 LED. By far my favorite flashlights
Buy this:
http://www.batteryjunction.com/olight-t15-r5-v2010.html
I am a fan on the single cell AA lights. I have been using one of these on a daily basis for mare than 1 year. Most useful light I have owned. Great switch. I have not been able to break it yet.
Another vote for 4 Sevens
Ive also been happy with my fenix ld12. Its forward clicky with momentary on if that matters. Very easy to set to high and leave it. I also have an oldrr nitecore that had been very good. Never had a 4sevens, but always see great reviews for them.