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Headlight eyelids on while car is parked/asleep

Discussion in 'Model S' started by jmnieves, Jun 10, 2018.

  1. jmnieves

    jmnieves Member

    Joined:
    Nov 5, 2017
    Messages:
    58
    Location:
    New Jersey
    I just noticed my MS which is parked in my garage plugged into a HPWC but not charging and the eyelids on the headlights are dimly lit. I never noticed that before. eyelids.jpeg
     
  2. Derek Kessler

    Derek Kessler Member

    Joined:
    Apr 15, 2016
    Messages:
    864
    Location:
    Cincinnati
    What you're seeing is LED afterglow — basically a tiny amount of current is left in the circuit and the LEDs are drawing on it. It'll fade out eventually.
     
    • Informative x 1
  3. appleguru

    appleguru Member

    Joined:
    Mar 15, 2017
    Messages:
    553
    Location:
    US
    If this fades out after a while, it is likely the phosphor on the white LEDs glowing (similar to how a glow in the dark toy will fade out over time after it stops being exposed to light). White LEDs are actually blue or ultraviolet LEDs with a rare earth phosphor coating that converts some blue photons to yellow photons as they leave the LED’s built in optics.

    If it doesn’t dim/fade out after time then it is likely that the circuit is still energized (but off) and that you’re seeing the effect of leakage current going through the LEDs...
     
    • Informative x 1

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