I'll tell you what, I'm REALLY impressed with my Fenix PD30. I picked up two of them (on sale for $50 each) at the Calgary gunshow a little while back, and one now sits on my AR as a weaponlight.
The other is now my new EDC light.
It's got a bezel-selectable "variable" or "turbo" mode - screw the bezel down and you get the full 245 lumens, first-press of the button. 1.5 hours continuous rated, and definitely bright enough for anything inside 100m. Tried it out against a treeline in a city park, and I could have read a nametag if I needed to at about 80yds+. A half-press here gets you a strobe that is surprisingly easy to deal with from the "right end" but is disorienting as all get-out from the "wrong end." I stuck it on a table across a dark room and damn near fell over trying to get back to it. Had ZERO peripheral vision, and ZERO viz past the light.
Unscrew the bezel just a 1/4 turn or so, and the first press gets you a 10 lumen "lowest" setting, at which the flashlight is rated for 65 hours continuous usage.
Half-press the button once more, and it's now about 70 lumens (these numbers are approximate, since I don't have my product insert with me - it's all stated explicitly in the product literature though). About 7 hours runtime.
One more half-press and you're up around 120 or so (I think?). 4 hours runtime.
One MORE half-press and it's a dot-dot-dot dash-dash-dash dot-dot-dot SOS blinker at full illumination. You could stick it light-up in the snow or dirt and have a beacon on while you slept, for example. 4-6 hours or so stated runtime; I'd have to read it again.
At any rate, you can get a surefire mount (as I did for my AR) which provides a nice no-tools fix for picatinny mounting. If you want to "Red Green" it to your barrel I'm sure that'd work fine too, in a pinch.
Damn fine little light, and with a retail between $70 and $90 most places you look, it's a lot of light for the scratch. Don't forget to buy more lithium batteries for it though; they're a lot cheaper by the dozen or hundred-pack from a dealer than they are in singles or pairs from the drug store... I use the SureFire brand with a 10-year nominal shelf life at room temp, so I don't really worry about not going through a few dozen in 10 years...
Also, on all settings (lowest to highest) there's a nice central beam for spot illumination but there's a REALLY nice, soft, scattered 'corona' that makes navigation or reading a snap. Really, really nice light for the money IMO.
-M