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Thread: Looking for a modder for First Light USA

  1. #1
    usdiver's Avatar
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    Default Looking for a modder for First Light USA

    I have a First-Light USA MC and NV 425 that arenít getting any use.
    Looking for someone who can bore the battery tube, head, and tailcap to 18mm diameter as a trial project. I ve considered 18650 battery use but the voltage isnít enough so I m now considering 2x 18350. Not sure how this might pan out but any thoughts or concerns I m all ears.
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  2. #2
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    Default Re: Looking for a modder for First Light USA

    These topics usually run in "Homemade and Modified" .... Thread moved.
    Last edited by archimedes; 09-21-2019 at 12:00 AM.
    ... is the archimedes peak

  3. #3
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    Default Re: Looking for a modder for First Light USA

    Thanks I wasnít sure
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  4. #4

    Default Re: Looking for a modder for First Light USA

    I dunno, unless you already have some 18350s I wouldn't bother. Sure they might give you up to a 30% increase in run time vs. 16340s and about the same from lithium primaries ...maybe, but the cost of getting it bored and the new cells...is it worth it? Are they not getting used because of the battery type or some other reason?
    Last edited by lightfooted; 09-21-2019 at 09:10 AM.

  5. #5
    usdiver's Avatar
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    Default Re: Looking for a modder for First Light USA

    Tired of running 16340ís down.... spoiled by HDS 1 cell 16340 runtime
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  6. #6

    Default Re: Looking for a modder for First Light USA

    Too bad no one has come up with a Li-Ion, six volt cell to replace double 123As and is of decent capacity. Also too bad that First Light doesn't seem interested in embracing rechargeable cells. With what they charge for these lights, I guess they don't have to.

  7. #7
    usdiver's Avatar
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    Default Re: Looking for a modder for First Light USA

    Yeah itís a bit sad. The MC is a modded nichia b with approx 500 lumens... gorgeous tint and I have some custom titanium tubes I could experiment with but the tailcap, the head are the main issues plus boring enough of the tube without cutting into the threads. It would be close I think
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  8. #8

    Default Re: Looking for a modder for First Light USA

    Quote Originally Posted by usdiver View Post
    Tired of running 16340ís down.... spoiled by HDS 1 cell 16340 runtime
    isnt the difference in runtime directly related to the difference in output?
    the HDS 250 makes just 166 lumens after step down

    while the FL makes 3-4x more lumens.. so of course they use batteries faster.. no free lunch

    one of my concerns is that you are considering running two LiIon cells in series. Do you realize there are risks associated with mismatched voltages? be careful

    some data on battery capacity
    two CR123 = 3000mAh
    two 16340 = 1300mAh
    two high cap 18350 = 2200mAh
    one 18650 = 3600mAh

    seems to me, if you like the HDS output, that an 18650 tube would give you the longest runtime, for use in the HDS, not in the FL, which as you pointed out, needs to see more voltage..

    from where I sit, if you want a dual 18350 tube for your FL, it might make sense to just have a tube made from scratch, rather than risk damage to a stock tube, from boring it out..

    I hope you find a solution that works for your needs
    Last edited by jon_slider; 09-21-2019 at 11:58 AM.

  9. #9
    usdiver's Avatar
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    Default Re: Looking for a modder for First Light USA

    Thanks Jon I agree with you but the real challenge is boring the head as the head area is only larger enough for the 16340ís unless possibly could use a spacer but I m not liking that idea.
    The tailcap presents another challenge and so forth but I d be willing to do it if I could get more juice out of it.

    The way itís looking however is itís going to be a no go. My 219b Mc is already a mod but itís quite useful so I was considering my nv.
    I hear First light designed these for entities that had a running supply of cr123ís but I donít know for sure
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  10. #10

    Default Re: Looking for a modder for First Light USA

    Government contract I'm sure. Which is probably the reason for the lack of change and the reason for the high prices. Although I've never heard of their lights being used by actual troops...it's not an impossibility.

  11. #11
    usdiver's Avatar
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    Default Re: Looking for a modder for First Light USA

    You are likely correct about the contract but I have seen us gi issue sales on some of these and some of these look like theyíve been in battle and they still work.
    They are among the best lights I ve had but still arenít that popular however the T Max LE 700 is a true life saver if you do any security or police work involving traffic. The platform itself is really good hence my urge to improve.
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  12. #12
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    Default Re: Looking for a modder for First Light USA

    Quote Originally Posted by jon_slider View Post
    some data on battery capacity
    two CR123 = 3000mAh
    two 16340 = 1300mAh
    two high cap 18350 = 2200mAh
    one 18650 = 3600mAh
    Be careful of this one. You can only directly compare mAh with cells of the same chemistry. You should convert to watt hours instead.

    On top of that adding cells in series does not add their mAh but instead their voltage. Where as adding them in parallel adds their mAh but not voltage.

    How you access that energy is also important. If you have a single 3v class LED having two cells in parallel is better as the voltages more closely match the LEDs meaning it will be more efficient no matter what type of regulator you use.

  13. #13

    Default Re: Looking for a modder for First Light USA

    Quote Originally Posted by staticx57 View Post
    Be careful of this one.
    thank you!

    like this?
    two CR123 = 1500mAh x 6v = 9000
    two 16340 = 650mAh x 7.4v = 4810
    two high cap 18350 = 1100mAh x 7.4v = 8140
    one 18650 = 3600mAh x 3.7v = 13320 (but not enough voltage for FirstLight)

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