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  1. M

    Your Flashlight Passion: How did it start?

    hmmm, a flashaholic life story? in how many words? well, I will attempt to keep this short. in the late '40s in semi-rural SW Minnesota, powerline wires over long distances of open fields meant that power failures were routine with nearly every storm due to wind or ice. Power outages were...
  2. M

    Help Needed...Flashlight Not Working :-(

    hmmm, I had very erratic problems (on/off/output) with a Zebralight SC52 (1xAA) when the cell was too long for the tube and the cell was exerting excessive pressure on the head. In my case, a Keeppower cell (w/protection IC) was simply too long for the SC52. maybe a length comparison between...
  3. M

    Help Needed...Flashlight Not Working :-(

    Use some WD40 on the base of the spring in the body where it contacts the aluminium. then attempt to rotate or at least somehow move the spring inside the tube. I have had problems with those springs losing contact before.
  4. M

    Help Needed...Flashlight Not Working :-(

    I am not familiar with that light, but: - unscrew the head and tail cap. or whichever end unscrews. - soak a cotton swab in DEOXIT, or WD40 if no DEOXIT, and wipe the outside contact ring inside the head. then wipe the center contact inside the head. - soak the other end of the cotton swab...
  5. M

    In case of an EMP - Does my Computerized Flashlight Still Work?

    without belaboring sausage grinding regarding EMP et.al., the Wall Street Journal for today (28FE7) also had an article about Super-EMP weapons on page A17 Opinion page. however, in an effort to avoid transient journalism, here is a site containing many details about EMP. lots of reasonably...
  6. M

    Are you flood or throw?

    well, tossing my 2 Pfennig worth into the commentary: => Yes, most of us have evolved to a mixture of lights, more or less throw, more or less flood. => the official beam distance given for lights needs to be divided by at least 2 for a 'seeable' distance. I think the divisor is more like 3...
  7. M

    Help me think: 3rd world country lighting and charging solutions

    Peripatew, a correction to one of my recommendations above: Somewhere up above I referenced the DROK USB V/A meter available on Amazon. I believe I recommended the more expensive unit between the ~$10 and ~$13 units. I was wrong on the features allocated to each one. Both of them have the...
  8. M

    Power Outage, How many Lumens, How many batteries? (for lights and more)

    If you use one of the Honda generators, and especially any generator with a 'computer' output, an additional regulator is probably not necessary, except for utilizing the usual surge arrest-type of outlet box. The links above normally refer to an electronic regulator. The most expensive of...
  9. M

    Help me think: 3rd world country lighting and charging solutions

    that is 15-22V open circuit. The resistance of the solar cells drops the voltage quickly when sinking current into the L-A battery of a vehicle. sort of self-regulating in a way.
  10. M

    Flashlight industry outlook - Research

    Well, hmmm, the flashlight market is mostly driven by the LEDs available & the extent of battery power available to drive them. Perhaps a better starter would be to look up "Cree" for LEDs, or Panasonic/Sanyo for the most popular batteries in Ni-MH or Li-Ion chemistries. Look up the research...
  11. M

    Help me think: 3rd world country lighting and charging solutions

    Ref the Streamlight solar panel referenced in the link above. 0. SL states that the panel was developed with law enforcement vehicles in mind. Although the panel is diode protected against draining the vehicle battery when the sun is down, the mounting/wiring process is not for the faint...
  12. M

    Power Outage, How many Lumens, How many batteries? (for lights and more)

    Poppy, I no longer open up the cases on chargers to see what the designers did, unless some operating characteristic makes me curious. The firmware is inscrutable (sic). IOW, How any of the commonly available chargers function under questionable Mains conditions is unknown to me. I...
  13. M

    Help me think: 3rd world country lighting and charging solutions

    Hallo Peripatew, Concerning your deliberations regarding solar panels and 12V vs 5V or a combo solar panel that has both 12V and 5V: Short incoming synopsis: Solar power is highly overrated for actual output power (maH) in the course of a solar day at moderate latitudes such as US & Europe -...
  14. M

    50 years ago -- Great NE USA Blackout

    less well understood by the public is that these big steam-fired power plants may be 'tripped' off-line for safety and the built-up steam vented to the sky, but those big generators have to be powered, usually for over 24 hrs, to keep the hot shafts rotating or the hot shafts will physically...
  15. M

    50 years ago -- Great NE USA Blackout

    The 1965 blackout had many repercussions in electrical network planning. Perhaps the most challenging of them was the plan put forth by the then Secretary of Energy James Schlesinger to tie all networks in the US together to ensure an adequate supply of energy to regions with questionable power...
  16. M

    50 years ago -- Great NE USA Blackout

    Yes, I was present for the display of spreading darkness in Syracuse NY living in a dorm overlooking the city with a good view of Syracuse. For me the first inkling I had that something was wrong was when I was in a convenience store and the incandescent bulbs started dimming, and dimmed far...
  17. M

    Help me think: 3rd world country lighting and charging solutions

    FWIW regarding lead acid cells commonly used in automotive applications: short bursts of high-ampere discharge followed by relatively long charge cycle. The car L-A battery has changed drastically from the '50s when I started paying attention. In the 'early days', the AH capacity was the...
  18. M

    Power Outage, How many Lumens, How many batteries? (for lights and more)

    Most of my working life was in R&D (Relax & Dream), and mostly in a defense company - the military-industrial complex that Gen Eisenhower warned us about. Over 1/2 of the Navy electronics failures were because of power supplies, and primarily because they could not deal with the many power...
  19. M

    Help me think: 3rd world country lighting and charging solutions

    Some data from the RAVPower 15W Solar Panel (3 panels): Using the DROK USB meter (dual V/A display) and the DROK USB resistive load (1A & 2A switchable) at solar peak (nominally noon in Wisconsin) in an early November Sun in a cloudless sky: I have demonstrated to myself that I can pull 1A...
  20. M

    Power Outage, How many Lumens, How many batteries? (for lights and more)

    One aspect of a power outage, or brownouts, that has not been adequately addressed is that of power that does not meet the standards for 110-120VAC @ 60Hz or 220-240 @ 50Hz. Most silicon foundrys have to dump their developing product if the power even fluctuates. Southern CA is well known for...

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