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  1. #31
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    Assuming its unloaded output is 12V, I'd say you've overloaded it and the output has dropped. If you connect only one LED does it consume 5W?
    Chris

  2. #32
    BobL is offline Member: Blue and white apron brigade
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    Are you using the power pack that's supplied in the base of the lamp or something else?

  3. #33
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    Quote Originally Posted by Chris Parks View Post
    Chris, did you do a thread on your VFD drill press install?

    Thanks
    Ian

  4. #34
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    Quote Originally Posted by jack620 View Post
    Assuming its unloaded output is 12V, I'd say you've overloaded it and the output has dropped. If you connect only one LED does it consume 5W?
    Yes, I thought that would happen. Will do some more checks on weekend.
    Will try running lights in series as well.

  5. #35
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    Quote Originally Posted by BobL View Post
    Are you using the power pack that's supplied in the base of the lamp or something else?
    Small supplied plug pack. Want to try and get away with only using ONE of them, due to space requirements. More tests to do.

  6. #36
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Sterob View Post
    Small supplied plug pack. Want to try and get away with only using ONE of them, due to space requirements. More tests to do.
    So, trying to drive two lamps from the one pack - I expect that will have something to do with what you are experiencing.

  7. #37
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    Quote Originally Posted by BobL View Post
    So, trying to drive two lamps from the one pack - I expect that will have something to do with what you are experiencing.
    Yes, it wasn't a surprise. You have to try theses things, don't you.

  8. #38
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    Got 5 minutes today to test the setup with the lamps in series.
    Light output seems good and was still getting 275 mA. Think I'll go with that.

    https://photos.app.goo.gl/jXkp9w6x9JHivXsL6

    Next is to get it all mounted and usei t!

    Steve

  9. #39
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Sterob View Post
    Got 5 minutes today to test the setup with the lamps in series.
    Light output seems good and was still getting 275 mA. Think I'll go with that.
    Are you sure you have your "series" and 'parallel" right.

    Depending on the grunt of the power pack, two devices in series will usually draw half the current compared to when they are in parallel.

  10. #40
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    Quote Originally Posted by BobL View Post
    two devices in series will usually draw half the current compared to when they are in parallel.
    Unless the parallel devices were overloading the power supply causing it to enter overload protection. But confused terminology is certainly a possibility too.
    Chris

  11. #41
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    Wink

    Yes, I have 'series' and 'parallel' terminolgy right.

    LEDs are current driven devices, so running them in series means the same current goes through both LEDS.
    It appears that this setup works fine. The brightness of both lamps are the same and at a good level.
    I still have 275 mA drawn from the plug pack, I am not overloading the plugpack. If the voltage is high enough to forward bias both leds, then we are golden.
    I suspect that if there was a problem the plug pack would get very warm in a short space of time. Its does not.

    I think the job is done and I'm very happy with it.

    All that reamins to do is to use over a long term, and see if anything arises.
    Steve

    https://photos.app.goo.gl/QqgT32mn2d7uTRLP7

    https://photos.app.goo.gl/bUyyKeCnptxG7rxq6

    Sorry Chris....I didn't want a shadow....

  12. #42
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    Quote Originally Posted by Sterob View Post
    I still have 275 mA drawn from the plug pack, I am not overloading the plugpack.
    You’re probably right. But you aren’t getting 5W from each LED either. I think you said the power supply was 20V? If so, that’s 10V across each LED and 2.75W power dissipation per LED. But if you’re happy with the lumens, you’re sweet.
    Chris

  13. #43
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    Hi Guys,

    Some of these electronic power supplies are designed to current limit ! That is the voltage varies whilst the current is limited to a set value. The only way that you can test that is by measuring the DC output current into a single load, then doubling the load and measuring the current to see if its doubled as expected !

    There are some very clever LED driver chips around, particularly for automobile lighting.
    Best Regards:
    Baron J.

  14. #44
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    My drill. My friends idea. Works a treat.
    (Selfie light from Amazon)
    Attached Images Attached Images

  15. #45
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by skypig View Post
    My drill. My friends idea. Works a treat.
    (Selfie light from Amazon)
    NOICE! How many watts/lumens?

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