Hmmm... Problem is that a single LS LED is about as bright as 10 or more of the "normal" 5mm Nichia LEDs. Hard to squeeze a whole bunch of the 5mm's into a package the size of the Arc LS. The Arc LS is really in a class all by itself right now.
The Arc AAA and the CMG Ultra are okay as far as size goes, but those put out somewhere around 1/10th the amount of light as an Arc LS. Still, they are very useful as task lights, or even for walking around at night. The Arc AAA EV (turquoise), sometimes available at
www.texastacticalsupply.com, is amazingly bright. Also the Photon III turquoise is similarly bright, but offers a much shorter runtime.
If you're willing to step up in size a bit, an LS mod'd 2AA minimag would offer similar or even better light output compared to the Arc LS. Check out the MADMAX, BADBOY, and ill-pill postings in the B/S/T channel for those little gems. I'm waiting on a MADMAX from dat2zip right now.