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Lightning causing led bulb power effect

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    Lightning causing led bulb power effect

    This happened as my sister described it. Their new house has an open walkway to the garage, and one, what she is sure is an led bulb. She said when there was lighting near it would momentarily light up, and make a popping sound.


    I explained, off the top of my head that the driver circut probably has a transformer that is effected by the lightning creating a temporary flow to the led. This is an assumption and would like your opinons

    Their house is I think 100% led lights but just the bulb outside in the open area does it.

    Could find nothing on google as most results were relating to other things

    Am I anywhere near right on this?

    Fyi the bulb is on a simple switch, no digital controls
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    #2
    Re: Lightning causing led bulb power effect

    the cable-run to it is probably acting as the antenna.
    i'm not sure i'd trust it if it made a "pop" though - maybe the electrolytic burst!!

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      #3
      Re: Lightning causing led bulb power effect

      Did she have a little too much wine when observing this? I've never heard of such a scenario (the popping)..... Mainly, I don't see the driver being able to take such surges and survive....but stranger things have happened. At some point, you need to autopsy the bulb and see what's in it.
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        #4
        Re: Lightning causing led bulb power effect

        Sounds almost like a grounding problem. Get her to make a picture of the bulb. Some cheap Chinese leds that have capacitive droppers are easy light up.
        Last edited by CapLeaker; 11-16-2019, 02:15 PM.

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          #5
          Re: Lightning causing led bulb power effect

          I have seen a ghost flashing LED fixture when power was off.
          It turned out to be the on/off switch was switching neutral, not hot.
          So the LED bulb's power supply always had hot (but not neutral) at the AC input and any stray capacitance to ground (on the floating neutral return) or antenna action is enough to charge up the LED bulb's cap and blink once in a while.
          In Nomex cable, there is capacitance to the GND conductor.
          Some LED bulbs use no SMPS, just a CC source inside and they light up with microamps. The SMPS bulbs will blink every minute or so.

          So any mains spike would make the LED bulb blink due to capacitive coupling, if this is the wiring issue.
          I would be worried about the 'pop' sound- that could only be an arc from a mains spike? There must be a problem with failed insulation?

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            #6
            Re: Lightning causing led bulb power effect

            well leds are current-drive so it's possible that several hundred or even thousand volts lit the led and blew the small output cap.

            for ghost leds ElectroBoom had a video.
            https://www.youtube.com/watch?v=_bgUy6zA0ts

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              #7
              Re: Lightning causing led bulb power effect

              Originally posted by stj View Post
              well leds are current-drive so it's possible that several hundred or even thousand volts lit the led and blew the small output cap.

              for ghost leds ElectroBoom had a video.
              https://www.youtube.com/watch?v=_bgUy6zA0ts
              Right on stj. That's the vid I was thinking about.

              Comment


                #8
                Re: Lightning causing led bulb power effect

                Originally posted by CapLeaker View Post
                Originally posted by stj View Post
                for ghost leds ElectroBoom had a video.
                https://www.youtube.com/watch?v=_bgUy6zA0ts


                This guy is real funny and crazy he does real stupid sh*t

                But he does explain it very well
                Last edited by sam_sam_sam; 11-17-2019, 07:22 AM.
                9 PC LCD Monitor
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                25 Servo Drives 220/460 3 Phase
                6 De-soldering Station Switching Power Supply 1 Power Supply
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                1 HP Printer Supply & Control Board * lighting finished it *


                These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
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                All of these had CAPs POOF
                All of the mosfet that are taken out by bad caps

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