Recent content by J_C

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  1. J

    Single AAA LED lights.

    Another vote for I3e. Nothing matters as much to me as being the smallest AAA form factor possible, as long as it's at least got 50lm. Well, also there's no way I want a tiny unreliable switch in a AAA form factor or to make it longer still to shoehorn in a logic switch to gain reliability, so...
  2. J

    Unusual Request for a led that that gets hot

    Makes no sense to me. Just build a larger battery pack to use with existing handwarmers that you find to have too little runtime.
  3. J

    Mechanic flashlight

    +1 For Nebo Big Larry. Besides my EDC, that's mostly what I use for a mechanic's inspection light (though I have the older version with just the side COB), then break out something larger for the actual work. I'd rather it took 2x18650 cells for better runtime, but have plenty of Eneloops so...
  4. J

    Relevance?

    I realize you posted this in the incan flashlights subforum, but it applies to bulbs in general as do things others already wrote which I agree with, especially CRI. As far as flashlights, I have plenty of rechargeable batteries and haven't gotten around to modding all of my incan flashlights...
  5. J

    LED Lighting For John Deere GT225 Garden Tractor

    This, or one of several other LED light bars available. Some riding mowers have a stator that outputs AC to the headlights (and limited current so you might want to remove the factory bulbs to lower the current) in which case you'll get better performance throwing a basic bridge...
  6. J

    Another SK68 Clone, Huwai Fengxing

    I wouldn't invest in 14500 for those, too bulky for a pocket carry light and if not pocket carry then I'd go with a light using a larger Li-Ion battery than 14500. IMO their beauty is in how versatile they are for so cheap, and cheaper still if it can take a spare Eneloop NiMH that I already...
  7. J

    7x CREE lamp - max voltage

    The max voltage is 12V, that's all the heatsinking was designed for. Yes it will shorten LED total lifespan or cause immediate failure during use. Any higher and you risk failure, but you have a little margin with wind and temperature, riding a bike in winter. Get an infrared thermometer and...
  8. J

    New Thrunite Ti

    I don't think so, not to include a tail switch and protruding cap on it. With the non-removable pocket clip it's obviously meant for people to carry it that way so it only needs be as short as the pocket depth rather than trying to be a keychain light which it isn't. Granted, this also makes...
  9. J

    ITP A3 EOS & Maratac AAA Reviews: RUNTIMES, BEAMSHOTS, DETAILED PICS & more!

    Re: ITP A3 EOS & Maratac AAA Reviews: RUNTIMES, BEAMSHOTS, DETAILED PICS & more! Sorry to revive such an old topic but this seems to be the main topic for the iTP EOS A3. Was there some kind of last generation redesign with a different keyring clasp, higher lumen output, and price reduction...
  10. J

    New Olight I3 versus ITP A3 EOS (PICS!)

    I know this is an old topic but it seemed the appropriate one for a question. My old ITP EOS A3, titanium with 3 modes, first mode is medium brightness, whichever generation that is. The head died. I disassembled it and it appears that the battery contact board was not well enough fixed in...
  11. J

    1.5 V, Li-ion is not recommended

    The issue is that a typical current regulator IC is either buck (drop) or boost (raise) voltage, or those that could do either have different circuit configuration to do one or the other. A controller "could" do both, have a boost circuit to raise voltage first, THEN buck to drop it to a...
  12. J

    How to reduce light output?

    Indeed it is unlikely you will find such a high voltage driver with lower than 300mA current, so there are five different alternative ways I would attack this, meaning I'd choose any ONE of them, not a combination of all. 1) If I am to trust your specs for mA and V, then they must all be wired...
  13. J

    Battery input voltage vs LED Vf?

    The typical way to do that is you put a minimum of one of each type (of each different Vf spec'd) LED in series with one of each of the other with different Vf, then your buck driver regulates current. It doesn't matter what the Vf drop is then because the driver circuit regulates to the right...
  14. J

    How to measure flashlight/lantern runtime by current drawn from battery`s

    That would explain it. They can design the driver any way they want. Often drivers are designed, or their high error results in lower drive current as input voltage decreases, but if it does manage to keep output regulation good, then as input voltage drops, input current has to rise, by a...
  15. J

    Checking my DMM DC Voltage Accuracy

    A lot of the TO-99 package AD584 I see on eBay look counterfeit. Non-crisp ink, more rounded on top, maybe taller can too. Wouldn't surprise me if those aren't factory calibrated ICs at all, meaning your meter could actually be more accurate than it is.
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