“Add this to it's long list of qualities (voltage regulated which allows for 121 hours of burn time on high and over 200 on low”

I wonder where that came from ?!. According to PT http://www.princetontec.com/?q=node/118 (click on BURN TIME) it’s 1 hour on high and 11 hours on low for their new Rebel EOS. It has a 50 lumen output.
For better runtimes, brighter outputs, lower battery costs, and lighter, it still appears the zebra light is better http://www.zebralight.com/index.php?main...bd5jqtqc34q2fe6 H50-Q5 or H30-Q5.

And even lighter and brighter yet is the Fenix L0D: https://www.fenix-store.com/product_info.php?cPath=22_69_49&products_id=257 It also does better on batteries than the EOS. Just clip it on your hiking hat.

-Barry