Very interesting thoughts!
I don't hike with 800 lumens of light on constantly. I'm often out for 3+ hours at a time. I find myself typically using a floody low output headlight for the majority of a hike as I like to keep my eyes night-adjusted.
That said, I also like to have a BRIGHT light as sometimes we come across critters and "things that go bump in the night" as well as situations where a potent light is needed. Instant on is a consideration as is beam quality. A year ago we came across a river that we needed to cross. We used a higher-output light to help find the safest route down the cliff, across the water, and back up the cliff on the other side. I was able to remain stationary on one side as my buddies crossed to my light. Another time we came across a fresh kill... we used a bright light to search that the area was clear and find the quickest way out.
That said, it takes me 30 seconds to swap the cells. And each cell is incredibly light, so packing a few is a non-issue weight wise. I can have hours of runtime with me if needed. I also believe that one light is no light, and two lights are one light. However, to have a light this bright, with such a perfectly balanced beam, with SAFE non-venting cells (do a search on 123 venting incidents, including tests by Newbie... I had one light destroyed due to venting, and now keep my spare loose 123s stored in an ammo can)... like all things, it is a tradeoff. Also, the light is almost the same size as a Surefire M3T, with around 3x the output, with similar runtime... or similar average output to a Surefire M6, but with a single, rechargeable cell vs. reams of expensive (and potentially dnagerous) 123s. Also this beam will stay in regulation, whereas these incans will reduce in output during their run. There are very few LEDs in this class.
I'd also suggest reading up on A123 cells. I think we'll start seeing more and more applications of these cells in high-draw lights such as similar multi-LED lights and hotwire incans. This light could have been built with LiOn 18650s but they have issues with such high-draw applications.
So, in balance, this is the first LED that I've owned that matches the output of some of the finest incans on the market, with safe rechargeable cells (I can pick up spares at my Lowes and Home Depot stores
), and a level of redundancy that can't be matched.
I hope that helps!