Heh -- and I thought I'd been following the brand-development of LED flashlights pretty closely! I finally come here and discover ARC, which I had never heard of before. I guess now I'll have to buy one.
Anyway, to be on topic: I recommend some of the *cheaper* LED flashlights. There's one by Brinkmann that you can usually find at Walmart. It's shaped like a black and silver toilet paper tube. It has a rubberized pushbutton on/off switch at the rear (it can be used for signaling: instant-on switch, or push hard for full-on), a focused (lensed) single LED that makes quite a good, tight, bluish spot. Runs on 2 AA batteries. I believe they sell for under $10. Sorry, I don't know the model name.
Also by Brinkmann is the "Rebel," another 2 AA batter LED flashlight with similar features as that mentioned above. Slimmer design, traditional flashlight (head is wider than body). Similar lensed LED and rear instant-on/full-on switch. This one comes with an amber, red and blue lens cover and also a belt loop/clip for belt carry. I got several of them for about $15 each at Walmart. Availability has been sketchy, though. Sometimes they have it, other times not. The Rebel is my favored flashlight. It provides a good, usable spot of light -- the traditional spot as opposed to the fuzzy-edged illumination of many LEDs that have no lense to focus them. I always have a Rebel in my flight bag for night flying. The red lense is very useful in a night-cockpit environment where night-vision maintenance is crucial.
I also carry several Photon Microlights. One is clipped through a brass rivet in the kydex neck sheath that holds my combo-edge Delica. They ride together under my shirt and are at all times available for use.
I also typically carry a Princeton Tec Attitude 4 AAA LED light in a cargo pocket of my carpenter's shorts. I like that one because it's waterproof.
---Jeffrey