Re: SSC P7 ??
It sounds like you have 2 separate needs: a light for close-up work with dark-adjusted eyes, and a light for navigating dense woods at night. You could go with an adjustable light (e.g. the new NiteCore
D10 or
EX10) and try to meet both needs in one light, or you could get a tiny light for the first need (I'd strongly recommend the
Fenix E01 -- 10 hours runtime + 11 more hours "night mode" in a hard-anodized package barely larger than the AAA it houses, for quite cheap), and a larger light for the second. There are many options for that second need.
I wouldn't suggest any *small* P7 light for that, since if the P7 is driven hard enough to justify using a P7, any light small enough to be considered "small" could not house enough batteries to have significant runtime. It's also new enough that the manufacturers haven't really finessed the design for the P7 yet, and it does require significant design changes to its host (e.g. many of them have a reflector that was meant for smaller, single-die LEDs, and the only change they made was to bore the hole in the bottom larger to fit the P7). The only P7 lights I like yet are the converted mags, which are huge by comparison to the "small" lights.
There are lots of Q5 lights that are small, have good runtime, and are bright enough to navigate dark woods. I like the
L-Mini, since it's quite small, can get quite bright, can use 17670 and 18650 cells, can tailstand, and has good choices for high, mid, and low modes, without being too expensive. I have, however, had to fiddle with how tightly it's screwed down to avoid dimming. I also like
this Sacredfire Q5 light, since it's bright and very durable, though the use of a 14500 battery might limit its usefulness (they're nowhere near as common as 18650 or CR123).
The above are just my opinions on those lights; I don't profess to be an expert. I do have all of them, but I haven't personally tested their runtimes. You can find much more scientifically-examined comments on lights like them in Bessiebenny's review thread.
BTW, an additional note regarding batteries: "18650" means 18mm tall, 65mm long, and the 0 means it's cylyndrical. Li-ion batteries are often referred to by their measurements, like that. The Li-ion replacement for CR123 cells is 16340, for example, and I mentioned a 14500 above (which is the same size, though not same voltage, as a AA).
Edit: One word of caution -- lots of P7 light manufacturers like to claim 700-900 lumen output, because that's what the datasheet says the P7 is capable of. The thing is, lots of these lights don't drive it that hard, or don't have C-bin P7s, or otherwise don't actually get close to 700-900 lumens. This problem isn't limited to P7 lights, but it seems much more common.
if they are overcharged or overdischarged.
:nana: 
