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Thread: What LED should I use in a keychain light?

  1. 10-19-2005, 02:22 PM #1
    frankr
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    Help What LED should I use in a keychain light?

    Which Led would you drop into a generic (photon like) keychain, the Nichia NSPW500CS or a 35 K mcd Led? Or would you recommend another LED? I’m mostly looking for brightness and very white, some blue tint, if its not to blue is okay. Thanks
    Last edited by frankr; 10-19-2005 at 02:24 PM. Reason: improve the formating
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  2. 10-19-2005, 09:40 PM #2
    vcal
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    Default Re: What LED should I use in a keychain light?

    If you don't need a lot of them, I'd suggest using the very best (I've seen yet):
    =from www.lsdiodes.com
    It'll cost you $2.54 US but it's worth it IMO. It can take a full 100mA of drive current without dimming over time, and is nice'n white too.
    Last edited by vcal; 10-19-2005 at 09:47 PM.
    Doug
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  3. 10-19-2005, 09:50 PM #3
    balazer
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    Default Re: What LED should I use in a keychain light?

    Is that the ISP 100-mA 5-mm LED?
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  4. 10-19-2005, 10:05 PM #4
    vcal
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    Default Re: What LED should I use in a keychain light?

    Quote Originally Posted by balazer
    Is that the ISP 100-mA 5-mm LED?
    Actually, it isn't the Korean ISP. I like this new 100mA one because of it superior whiteness.
    The ISP ones didn't seem as white......

    p.s.-LSDiodes sold me some really powerful color 5 mm LEDs too.
    Doug
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  5. 10-19-2005, 10:57 PM #5
    asdalton
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    Default Re: What LED should I use in a keychain light?

    The Sandwich Shoppe also has 100 mA white LEDs available for $3.25 each. I don't know if these are the same as the 100 mA LEDs mentioned in this thread. I do know that most of them have a low Vf and run well on a single 3-volt lithium cell (direct drive). They are also whiter than the typical Nichia LEDs.
    Andrew
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  6. 10-19-2005, 11:07 PM #6
    balazer
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    Default Re: What LED should I use in a keychain light?

    The Sandwich Shoppe 100-mA LED is supposedly made by ISP.
    http://candlepowerforums.com/vb/showthread.php?t=93217
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  7. 10-20-2005, 02:08 AM #7
    MrBadger
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    Default Re: What LED should I use in a keychain light?

    I have some Nichias running in a few of KevinL's keychain lights and I like them a lot. I also got a bunch of 35k mcds in the group buy. The 35k seem a bit more white, but the ones I have will be used for other projects. If I end up with some extra I might use them in a keychain light or two, but the Nichias make me quite happy for now.
    -Jeff

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  8. 10-20-2005, 09:38 AM #8
    frankr
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    Default Re: What LED should I use in a keychain light?

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  9. 10-20-2005, 03:15 PM #9
    MrBadger
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    Default Re: What LED should I use in a keychain light?

    Let us know what you end up with and maybe a quick review.
    -Jeff

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  10. 10-21-2005, 06:46 AM #10
    LEDninja
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    Default Re: What LED should I use in a keychain light?

    lighthound still got the mjled if you need a wide flood. 3 volts preferred (1x2032 instead of 2x2016 batteries).
    http://www.lighthound.com/images/ml/mjled_1.jpg
    http://www.lighthound.com/sales/mag_...ccessories.php
    Last edited by LEDninja; 10-21-2005 at 06:49 AM.
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  11. 10-21-2005, 11:57 AM #11
    frankr
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    Au Re: What LED should I use in a keychain light?

    I'm going to try the Nichias, the 35k mcds and the LEDs from www.lsdiodes.com , all are now on order. I'll report back with the results.
    I may also order and try the mjled. Thanks again for your input.
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  12. 10-21-2005, 01:27 PM #12
    twentysixtwo
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    Default Re: What LED should I use in a keychain light?

    a LED that can handle 100ma isn't going to help much if you can't deliver that much current - I suspect that 2 2016's isn't going to be able to.

    I have compared the 35k and the Nichia CS B0 and C0 side by side and I prefer the Nichia CS C0.

    It has more blue than the 35k, but puts out more light overall.

    The 35Khas a brighter and more focused hot spot and is whiter. Sounds like you might like that more in a photon clone.
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  13. 10-21-2005, 01:48 PM #13
    balazer
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    Default Re: What LED should I use in a keychain light?

    Two 2016s will deliver about 60 mA for the first couple of seconds, but it will stabalize at around 30 mA within 30 seconds or so.

    The MJLED casts a very wide beam, and would only be appropriate if you have a good reflector. For the kinds of reflectors you find in key chain lights, you'd be better off with an uncut LED. An uncut ISP LED is o.k.
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  14. 10-21-2005, 02:00 PM #14
    Primeight
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    Default Re: What LED should I use in a keychain light?

    I use my Inova X5. A little big, but I absolutly love that light
    I really don't like flashlights, I'm just afraid of the dark.
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