if you're looking for an awesome single-aa edc light, you wark a zebralight sc5too =)
hi all, just wanted to express my thanks again for all the suggestions and info from everyone - i received my sc51 yesterday, and i couldn't be happier - i haven't been able to stop playing with it since =D i've had to "seek out" darkness to be able to though - summer-time is just too light... so i've been spending a lot of time in corridors without windows, pausing in shaded areas, and wandering about my home at night =P
it's an exquisite little light, very well manufactured afaict with my limited knowledge of these things - it feels robust and is comfortable to use. it's surprisingly small =) despite having previously seen photos of it next a quark mini aa (it is about 10% larger volume-wise than the mini aa i'd say at a guess, mostly in diameter), i was still surprised at its size seeing it "in person" =P. it's currently living quite happily (in between being tested at every available opportunity) in my jeans coin pocket, where my mini aa was previously (the mini aa will now be my backup light). the solid clip keeps it nice and secure as well - no concerns about it escaping, and i could forget it was there if i wasn't so fascinated by it =). i'm very impressed with both the highest and lowest outputs - both are incredible. the ui is really good, easy to use and flexible with well-spaced brightness levels. i'd thoroughly recommend it to anyone looking for a flexible single-aa edc light.
at first, when i took it out of the box and started testing all the modes, i thought there was either something wrong or a misprint in the instructions. of course, there was nothing wrong - it was just impatience resulting in me testing in imperfect testing conditions - in my car at lunchtime, in bright sunlight =D .
when trying to do the "press the button quickly to cycle through the modes", it seemed like the light was going from "high" to "low" to "off", and skipping "medium". this impression was made stronger because first, when trying to turn on to "low" by pressing and holding the button for 0.5 seconds, i didn't realise that the "low" mode had actually activated, and kept the button held down a fraction of a second longer until it went to "medium", resulting in me thinking _that_ was "low". =P after a few minutes, i realised that as i was testing outside in bright daylight (damn summer... =P) i was just not seeing the supreme low-ness of the "low" mode.
when i realised, and looked directly at the emitter when it was in "low", i couldn't suppress a childish laugh at how low the "low" was - even though it was lit, i could actually see the "grid lines" on the base of the LED =o this is _exactly_ what i wanted. i have since tested in dark conditions, and it's perfect. (NOTE - i would only advise looking directly at the emitter _after_ you've put it in low mode, not while you're trying to change modes - until you get the feel of the timing, which only takes a few goes, it's possible to inadvertently make it turn on in "high", which if you're looking directly at the emitter, results in coloured spots in front of your eyes for a while... =| i guess it's possible even looking at it in low mode isn't advisable, but a second or two can't hurt, can it?).
a wee side note, not specifically to do with the zebralight, rather to the notion of "lumens" in general - one thing that this light has taught me is the visible difference (or lack thereof) that comes with increased lumens - don't get me wrong, the max 200 lumen output of this light is markedly brighter even in subjective terms than the 90 lumens of my quark mini aa, but in it doesn't "feel" (roughly) twice as bright. this is something that has obviously been discussed to death already on these forums and elsewhere, by those much more knowledgable about it than me, but i have read about how the human eye perceives an increase in light in a non-linear way, in that a doubling of lumens doesn't look twice as bright, so i fully expected this and i'm not disappointed in any way - the sc51 is still an awesomely bright light, especially considering it runs off a single AA, but it was very interesting to be able to compare the output levels in a way that i wasn't able to with my quark mini. i set the sc51's "H2" sub-level to the 100 lumens option, and switched back an forth between that the highest "H1" 200 lumens mode, and my purely subjective impression was that the increase from 100 to 200 lumens resulted in about 30-40% more brightness. this experience/knowledge will help me in future when trying to judge the capabilities of any new light i'm considering.