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  1. uk_caver

    Cheapest way to have emergency lighting? Im talking fuel vs battery ?

    I bought a couple of Sofirn LT1s (not LT1Ss) a year ago, one for home use, and one to donate to the caving expedition my club runs every summer (5 weeks camping on a mountain) which has traditionally used a Coleman lantern. I haven't had to use the home one yet, but the one I gave to the...
  2. uk_caver

    if i replace them weekly are alkines safe?

    For someone concerned about possible outages without charging facilities, for a light they regularly use (or one they want ready for instant use), I would have thought that keeping NiMH in the light long term and having other cells ready to reload in case of emergency would make sense.
  3. uk_caver

    Neat household MacGyver tricks you've learned

    The active ingredient (capsaicin) is an irritant for mammals, but not for birds.
  4. uk_caver

    Adaptive light output head lamp under $100

    There is the Petzl Swift RL - going from the cheapest UK prices (typically ~£70), it might be buyable for ~$100, and seems to have much in common with the Nao. Googling for headtorch automatic dimming brings up quite a few other possibilities
  5. uk_caver

    Is the problem my batteries or my new battery charger? (Battery analyzer charge test mode)

    Does it give consistent results for a given cell? Do all slots behave the same way? It would not be too surprising if AAs which had degraded to the point of having an actual capacity of 400mAh also had relatively high resistance. Looking at the manual: Note: When attempting to charge cells...
  6. uk_caver

    Neat household MacGyver tricks you've learned

    For individual wasps/hornets in a room, a rolled-up newspaper or equivalent can be made more effective by having a layer of inside-out sellotape/scotch tape wrapped around the end - start off with tape sticking to the paper, then twist and wrap the tape around in a spiral, sticky-side out, so it...
  7. uk_caver

    Neat household MacGyver tricks you've learned

    I recently had an outside drain which had its trap almost completely blocked with sediment. Water would slowly seep through, but not with nearly enough flow to clear anything away. Fortunately, I had a ~2.5m length of plastic drainpipe. Pushing it down into the drain made a sufficiently good...
  8. uk_caver

    Nitecore EA41 starts discharging if left longer than a week

    It would certainly seem worth getting in touch with Nitecore. I admire the persistence and curiosity it must have taken to get from 'this light just drains cells' to 'this light drains cells if it isn't regularly used'. Most people (likely including me) would probably have just stopped using...
  9. uk_caver

    Nitecore EA41 starts discharging if left longer than a week

    Having looked at some related Nitecore threads, did you try the 'drained' cells in anything else to double-cjeck they were really empty, or just recharge (NiMH) or dispose of (alkaline) them? There's *maybe* a chance of a subtle contact issue that might be remedied by just removing and replacing...
  10. uk_caver

    Nitecore EA41 starts discharging if left longer than a week

    What kind of non-use time does it take to totally drain the cells?
  11. uk_caver

    Nitecore EA41 starts discharging if left longer than a week

    I'm curious about what sequence of events/experiments showed cells starting to be discharged after a week of non-use. I can see how someone would notice cells having become fully or significantly discharged over time, but (unless the light just turns itself on) to find out when the discharge...
  12. uk_caver

    Beware Alkaline Cells

    As someone who uses both, but uses NiMH far more than alkaline, I have seen the occasional NiMH (usually someone else's) go a little crusty on the end, but (unlike alkalines) I've never seen one, however old, leak to the point of upchucking its contents all over the device it is inside and...
  13. uk_caver

    Beware Alkaline Cells

    Possibly lights are particularly susceptible to damage from leaking cells, as people (especially people with a lot of lights) may have lights which are rarely used, and left with cells inside for a long time? I used to make LED dive light inserts for friends, and I recently came across an old...
  14. uk_caver

    how about 21700 4500 mah battery vs energizer l91? im still deciding on my survial cells

    Wasn't the 1/10Amp just indicating the expected drain current of the cells? Though you're generally right regarding Watt-hours being the best measure, that does rely on what is being powered using the voltage/current efficiently - if using 3x L91s in a 3xAA light (or a 21700 in a single-cell...
  15. uk_caver

    NiMH leakage. Does it happen?

    Unless the cells have only done a few cycles, to have two have issues at the same time would make me suspect a [possibly transient] charger failure rather than a cell issue.
  16. uk_caver

    Can a Lithium ion cell be 2.4 volts?

    While possibly off-topic if Olight are (for some non-obvious reason) down-converting a regular Li-Ion to 2.4V output, naturally-2.4V lithium-based cells do exist, though they have somewhat lower energy density than regular Li-ions:
  17. uk_caver

    Question about the development of "edge-lit" LED lamps

    I built it a long time ago (when Cree MC-Es were new, so probably around 2008-9), and I don't think there were many (if any) equivalent commercial lights available then. The LED was left over from experimentation, with no other planned use, and back then, LEDs seemed to go from cutting-edge to...
  18. uk_caver

    Question about the development of "edge-lit" LED lamps

    I'm afraid that I don't know anything about commercial LED desklamps - my homemade one is just a ~400lm LED emitter glued to a PC heatsink, with the plastic holder for a TIR optic (minus the TIR optic itself) surrounding the LED, and a conical shield of aluminium foil wrapped around the holder...
  19. uk_caver

    Question about the development of "edge-lit" LED lamps

    I can understand that the lights you linked to might have advantages due to having a large emitting area (reducing shadows, etc), but thinking purely of never having a light source visible in peripheral vision, wouldn't a small LED source sunk inside a shield actually be better than a large flat...
  20. uk_caver

    Super Sabrelight LED conversion?

    A single piece of aluminium is used to make the reflector and the 'outer' battery contact (a chamfered disc of metal behind the reflector which is pushed onto the end of a pair of prongs running from the other end of the battery case as the bezel is screwed in).