Recent content by Bright+

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    21700 in my Sofirn SP35 suddenly died

    Highly doubt internal short. After I pushed the button back in per video, the cell had 3.8v and the light worked for considerable time. I think internal short would've drained the cell. Severe overload would've only happened due to engineering flaw. It was a Sofirn light with Sofirn battery, so...
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    21700 in my Sofirn SP35 suddenly died

    I don't plan on putting it back to use. I reset it, because I wanted to know what failed. I'm thinking the flashlight got hot enough from accidentally getting left on inside the pocket and "cooked" the battery hot enough to pressurize it. I feel that Sofirn should have designed thermal...
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    21700 in my Sofirn SP35 suddenly died

    Oh, it was the CID. Shortly after I made this post I followed the CID reset YouTube and the cell was revived. The battery had 3.8v left. The video is at https://www.candlepowerforums.com/threads/cid-protection-reset-18650.434728/#post-5103100
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    Any information on this Sylvania 8 amp charger?

    Something is off. In the features section, it says 6 or 12v. In the specs section, it says 12v or 24v.
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    Ryobi 40 Volt 300-Watt Power Source RYI300BG

    The USB-A version you linked looks like an actual power converter taking in 5v and stepping it up to 12v. The USB-C version is a communication module that command 12v from USB-C PD. There are two mainstream USB alternate voltage protocols widely in use. They're Qualcomm QC and USB PD. You're...
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    Sofirn SP35 popped 21700's fuse/CID in jacket pocket. Design flaw?

    I have an SP35 SF22Bxxxxx. Last I've seen it, I put it in my jacket pocket. When I tried to turn it on, it doesn't come on. The rechargeable 21700 reads 0.0v. It won't take any charge in the light, or with external power supply. I followed the video below and the cell was revived. After the...
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    21700 in my Sofirn SP35 suddenly died

    Reads 0.0v and I can't get it to charge. It was in my jacket pocket. I think it may have gotten switched on in the pocket and stayed lit on high. The light itself powers up "tethered" with charger hooked up. When I apply about 5v directly to the battery, it doesn't take-in any current, which...
  8. B

    what was the first led flashlight you owned?

    I think it was 2AAA or 2AA light... from Sears. single 5mm LED and that was like $6.99 back in early 2000s
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    Streamlight Protac HPL USB sustained output??

    I'm running some tests right now. I'm unable to produce the drastic drop indicated in the graph. The graph is terrible. No in-between scale. No indication of it being logarithmic or linear even.
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    Streamlight Protac HPL USB sustained output??

    The 1,000 lumen is not a regulated output according to their own fact sheet. You'll have to dig deep into the fact sheet to find the graph but it starts at 1,000 lm, then plummets to 500 lm or so in 7 1/2 minutes. Whether this is the function of freshly off the charger 4.2v cell or it's...
  11. HPL USB.jpg

    HPL USB.jpg

    • Bright+
    • Media item
    • Comments: 0
    • Category: LED Flashlights
  12. B

    I've been away for a while. what's a realistic net lm/watt these days?

    net being lumens leaving the flashlight divided by electrical energy out of the battery. So including all the optical and circuitry losses.
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    Seeking AA light 250lm >6 hrs but </=2 mode

    I don't think that's reasonably possible. I would say 100 lm/W is a good estimate for reasonably possible maximum when you consider board and optical losses. So you need 15Wh of usable power to have 250 lm for 6 hrs. The only way to get that much is with four lithium disposable AAs
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    Whole Laptop batteries transformed to ebike battery?

    I would be scared to mess with DIY battery setup that big for risk concerns. Even properly protected laptop cylindrical cells have had incidents. You've got to check your insurance policy to see if they would cover your home, car, or other people's property if you have a battery incident. There...
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    DC 6-15v ish to DC 75-250v ish 20-100mA range converter

    http://www.ledsupply.com/led-drivers/mean-well-ldh-series-cc-step-up-boost-mode like this one but in CCR output and a lot lower power. something that'll operate in 1-15w range.
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