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  1. jerry i h

    lecture on lithium cell internal short-circuits

    I found this nifty lecture titled Lithium-Ion Battery Safety Study Using Multi-Physics Internals Short-Circuit Model at this link (opens PDF file): http://www.nrel.gov/vehiclesandfuels/energystorage/pdfs/45856.pdf Sadly, these are only the slides. It takes some patient study to understand...
  2. jerry i h

    just got my Klarus MiX6 Ti

    (I still do not have a cam, so no beamshots or comparisons; pity: I now have 3 titanium AAA lights plus the older LD01 for comparison) First impression: i prefer it over LD01, Illuminati CA1-Ti, A3 EOS Titanium. Doing some white wall hunting, it has a slightly more cold, neutral tint than the...
  3. jerry i h

    clean your titanium threads

    This guy has been on my keychain for only 2 months, but the head has already become harder to twist :green:. I unscrewed it, and discovered the threads caked with dark powder; it kinda looks like graphite, but is surely titanium gunk. I took a dry paper towel and wiped out both sets of threads...
  4. jerry i h

    Coleman Ultra High Power LED torch?

    Cat. #2000003911. Anyone have one? Wish to pull the trigger, but I know better: see if any CPF'ers know about it first. It uses the MC-E, 6 x AA, and puts out 500 Lumens. Superficially, it resembles an ROP in power, form, and cells, but LED and cheaper, and ready to go right out of the box? Yes...
  5. jerry i h

    Review ITP A3 EOS Titanium

    Skipping to the end: I am truly impressed, and recommend it. For the past couple of years, I had an LD01 (Q5) EDC on my keychain. I have just received the A3 (XP-G R5) as the intended replacement. Sadly, I do not have access to basic tools: ruler, scale, or camera; sorry about that. It comes...
  6. jerry i h

    recommend a 1xAAA titanium keychain light?

    requirements: **small, lightweight, fits on keychain **replacement for LD01 **wish titanium **pocket rocket These are the contenders so far: **Preon 1 satin titanium **Titanium-Illuminati-CA1 **LD01 stainless steel edition any other suggestions?
  7. jerry i h

    Duraloops are alive and well

    Just a heads up: I got a package of the 'made in japan' and white paper disk on top at W*lgreens on sale (Gilman/Berkeley/SF bay area /Cal). They are usually $17 for a four pack, but I just a pack for $10.
  8. jerry i h

    replacement batteries and bulbs

    ...halogen: HPR36 (93L), HPR50 (85L, Rat Shack), HPR55 (48L); Bulbtown, etc. 41-1697 (Dorcy halogen, 66L) LZ13 (Lumilite Xenon, L = ?) LMSA401 (M*g halogen, L = ?) KPR103 (overdriven krypton 3D bulb) 41-1644 (Dorcy LED, 40L, yes: polarity reversible :huh:) Just for fun: 13 x 5mm LED lantern...
  9. jerry i h

    tech article - LED droop

    http://spectrum.ieee.org/semiconductors/optoelectronics/the-leds-dark-secret/0 http://www.scribd.com/doc/21615915/IEEE-Spectrum-Magazine-August-2009 The droop in the article is not about the sag in lumens from a poorly heat-sinked Lux. CFL has efficiency of 100 lm/watt, LED is 250, but only at...
  10. jerry i h

    How Many Watts for a Strand of Christmas Lights?

    I have a 60 LED strand of C6's that, according to the included instructions, takes only 5 watts. I also have a 70 mini-incan strand that seems to be 3.5 volts and 0.4 watts, so total usage is 70x0.4=28 watts. Does this seem feasible? I only ask because these beasties are all made-in-China, so...
  11. jerry i h

    Sylvania Dot-It Golden Dragon?

    Saw this: http://www.sylvaniaonlinestore.com/p-61-golden-dragon-under-the-cabinet-light-silver.aspx Anyone know anything about it? Is it worth $16? IIRC, the golden dragon puts out like 30L.
  12. jerry i h

    Rat Shack NUV LED - cute lil’ thing

    “5mm High Brightness Ultraviolet LED”. Catalog #276-0014. From the pkg: intensity = 280mcd, 395nm-410nm, 30 degree, 20ma, 3.2Vf, 3.8Vf max. It cost like $1.75 for a pkg. of 2. Judging by the rather strong pink-purple-ish tint, I would say NUV would be more accurate. I stuck this thing into a...
  13. jerry i h

    Usage Report: Baltic/brass/P4

    (in truth, it might be a Lux III; I can’t remember). This happy thing has been on my keychain for a year, and like the L0D-Q4 (natural finish) it replaced, it has done quite well and I heartily recommend it. Unlike other keychain lights, it looks none the worse for wear and looks almost new...
  14. jerry i h

    Field Test: 24-LED “Light Bulb”

    I got one of these at the local Ace Hardware. Unfortunately, there was no packaging since it was a small cardboard shipper with a bunch of “bulbs” in it, so I cannot tell you what the name is, or what the specs are. However, I am reasonably sure that this one is representative of other, similar...
  15. jerry i h

    Run time test: Energizer 2500MAh NiMH & Nite-Ize LRB-07-PR-ML

    The main culprit here is the budget power-failure light Vector BL350. When I first bought it, it had 2 generic NiCd’s. Once a month, I would completely drain them to give them a bit of exercise and so I could judge when they needed replacing. Problem: this beastie comes with a typical, generic...
  16. jerry i h

    Why Do CPF'ers Spend Money @ KD/DX?

    Recent example: I got a 18650 and DSD charger from a domestic merchant. He takes regular credit cards, I got the usual email confirmations, and it only took a few days to get my stuff. This same transaction with DX/KD would have been more involved, but, I am assuming, just as successful...
  17. jerry i h

    NFL Thursday Nite Football: quote of the week

    Chargers 24, Raiders 0. 10 minutes left in 2nd quarter. "This is bad, even by Raider standards."
  18. jerry i h

    LED Christmas Lights: Why Don't They Blink?

    Just got some strings. They consume only 5W vs. 20 or 50 or 70 watts for traditional Christmas strings. Understand the green advantages. Still: how come they don't blink at random intervals like cheap, generic Christmas lights? To me, it aint Christmas unless they blink. Is there a way I can...
  19. jerry i h

    Mini-Review - Peak Baltic/Brass Better Than L0D

    I had an L0D RB80 on my keychain for almost a year before I lost it. Then, I got the Baltic in brass from Peak. Question: is it as good? YES!! Firstly, many have complained that their website is stoopid. Agree 100%: when I ordered, I called, and complained to the helpful, polite gentleman...
  20. jerry i h

    Nirvana = Elektrolumens + P7 + 18650

    ...and quality of the highest professional caliber. I should also say that this puppy is a bargain. EL charges more or less the same price for a P7 m*g mod; the EDC-P7 is an entire custom lathe job. Expect EL to re-offer the EDC-P7, but at a higher price, but still worth every $0.01. Runtime...

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