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  1. R

    Sold/Expired WTB: 4Sevens Titanium Quarks (Regular not Mini)

    Open to any version/condition... what do you got?
  2. R

    Another Vent-With-Flame Li-ion Story

    http://www.trailscotland.co.uk/forums/viewtopic.php?f=4&t=9462a I particularly like this part about using a TIN pan to contain the mess :D. Never leave your Li-ions charging unattended!!
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    Any UI's with Momentary Max from ON?

    Curious if you guys know of any lights that have a momentary max function from ON - ie, from any lower mode in use. Something that can be operated single-handed and with enough fine control to signal Morse Code. Not interested in MM from OFF as most tactical lights tend to be. Pocketable...
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    AW 17670 PCB Failure... From Dropped Light?

    So I was about to take my dog for walk with my Quark Turbo X on a 17670 when I dropped it with the light on from about 3ft - light goes out once it hits the ground. After running all the usual tests, I find the light is fine and the batt. is dead - 0 volts, PCB kicked in. I try to reset it in...
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    Another Source 3V CRAA/14505 Lithium Primaries?

    Battery Junction has been out of stock for sometime now, and strangely after speaking to CS, they have no info on them (previous inquiries have yielded expected delivery dates). I guess is a pretty narrow niche battery, but the market was looking good given many new broad voltage AA/14500 light...
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    Want Battery Versatility in a Pinch? Carry This in Your Wallet...

    A few square inches of tinfoil and packing tape.... of course, having a wide voltage (0.9-4.2v) AA flashlight helps too. Set-up for using 9v and AAA batts: Notes: - make sure you know the pos/neg polarity since AAAAs from a 9v often appear opposite. - use tinfoil on the negative terminal when...
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    Can You Charge 3 NiMh In Series With An 18650?

    Just curious if it would be possible to field charge 3xEneloops, aligned in series, with 1x18650, using only wires linking pos-to-pos and neg-to-neg, like car battery jump. I assume it would only be a partial charge as the cells would equalize around 3.7-3.8v or so. Just wonder if it were...
  8. R

    Have DSLR? Want Ambient Lumen Meter?

    Then just consider the answer to the following questions. If you were to manually meter the ambient light of 100 lumens to be correctly exposed at 1/100ths of a second, then, all else being equal, what speeds would provide the correct exposures for: - 400 lumens ? - 30 lumens ? - 0.20 lumens ...
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    Easiest/Safest Way to Store Batts in Devices

    Not just flashlights, but any device. Assume I'm using lithium primaries and want to safely long term store batteries inside the device they will eventually be used in. I want to prevent parasitic drain, accidental activation, etc. for single and dual cell (in series) devices. Would it be...
  10. R

    Using a DSLR as a light meter

    I don't have a proper light sphere and just wanted to do some simple lumen comparison tests between some of my flashlights. Could you please tell me if this sounds about right, and of course, please advise me if I have anything wrong, or if I could do something else to improve accuracy. -...
  11. R

    Ever have an alkaline leak in a single cell device?

    I'm wondering if alkalines get an overly bad rep on the leaking thing. If people put half the care and monitoring into an alkaline, as they do with a lithium primary, or Li-ion, perhaps an Alk would never leak. I'm curious if the primary cause of a leaking Alkaline is a reverse charge...
  12. R

    Egregious Manufacturer Lumen/Runtime Claims

    So, as I shop for new lights to buy, I of course look at the manufacturers' website and check out the listed specs. In some cases, I'm shocked by how far off some these specs are from reality, when compared to user reviews and independent test, esp. Selfbuilt's (thank you Selfbuilt!). For...
  13. R

    Perceived Brightness vs. Iris Contraction - Question

    It's common knowledge here that our eyes do not perceive lumen increases linearly, so for example, you need to quadruple the lumens to appear twice as bright to our eyes. My question is: is that partially because our irises contract as brightness increases, or does this perception logarithmic...
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    Any Ultra-Portable Digital Volt Meters For NiMh?

    Anyone know of an ultra-portable digital voltage meter that doesn't require batteries? Something that can charge like Cottonpickers Li-ion chargers would be ideal, but even just the digital voltage meter that is powered off by the battery being tested would be fine. Unfortunately...
  15. R

    Flat-Top Batts and Reverse Polarity Protection

    I want to use flat-top batteries in lights with reverse polarity protection. I see most of these lights have the usual button-top positive contact point dead center in the head, and then are surrounded by other contacts, which I presume are the reverse polarity protection and sense when a...
  16. R

    Sub-Lumen "Moonlight" Mode Poll

    Everybody seems to want a killer Max mode - but what about the other end of the spectrum? What does the general CPF community think about the ultra low lows - the sub-lumen "moonlight" modes? EDIT: Just for reference, here's a sample of some popular brands/lights with sub-lumen modes (manuf...
  17. R

    Li-ion Best Practices - DoD vs SoC

    So I'm reading batteryuniversity.com, how to prolong lithium-based batteries, and notice there's new (to me, anyways) section on depth of discharge (DoD). I had long known from here and BU that Li-ions didn't like to stay at 100% state of charge (SoC), and had adopted practices like charging...
  18. R

    Li-Ion: Rules vs What, Why and How

    I'm new to Li-ions in flashlights and was wondering if someone could help briefly describe some of the most common "what/why/how's" of when things go wrong with this chemistry. I have read up on Li-ions here and know the general safety rules, but I'm not clear on what happens, and what to watch...
  19. R

    RMA Handled in the US?

    You guys know which of the foreign flashlight manufacturers can handle their repairs in the US? It's easy enough to see what the warranties are on lights, but if you end up having to mail a light back to China to get it fixed, it may not be worth the expense. Even if a manufacturer asks for...
  20. R

    Why such limited AA selection among premium manufacturers?

    I think Surefire only recently started to include AAs in its line-up, although I don't see any 1xAA lights, and HDS, who's big on single cells, offers nothing in AAs (any more) at all. And even the higher-end Chinese companies seem to premier their new lights in 123 well before following up with...

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