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Thread: Flashing rear lights

  1. #1
    Subscriber Click here to find out how to Subscribe
    Join Date
    May 2009
    Leeds, England

    Flashing rear lights

    I have recently purchased a helmet camera and I filming my bike and my wife's GS650. On playback I noticed the rear LED lights flash on and off at about indicator speed. The video is HD at 30 frame/second, this flashing cannot be seen normally.
    Do LEDs have a frequency? could this be why every bike I have had with LEDs seems to eat dipped headlight bulbs?

  2. #2
    Son of Ah Knah Yee Click here to find out how to Subscribe
    Join Date
    Nov 2004
    The North East
    Yes LEDs have a frequency, but it should make no difference to headlamp bulbs at all.

    Try Halfords Heavy Duty bulbs/lamps.

    PUI since 2004


  3. #3
    Subscriber Click here to find out how to Subscribe
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    Dec 2004
    Huntingdonshire (Cambridgeshire) & Bedfordshire
    LED's are normally multiplexed to control the brightness and save battery power - so yes this is normal. Nothing to to do with dipped headlight bulbs, they fail regularly because they tend to be switched on all the time.

  4. #4
    # C2, T1 ,T3 & T4 = Halo Click here to find out how to Subscribe
    Join Date
    May 2007
    the 'effect' you are seeing is much the same as when a TV picture is filmed/ video'ed
    Lo-IQ could give a more scientific answer.

    Again, of no relevance to the headlamp bulbs blowing at all

    Poise - The art of raising an eyebrow - not the roof.

  5. #5
    Toubab Click here to find out how to Subscribe
    Join Date
    Apr 2003
    Secure unit 2
    What they all said

    I can't see any reason why the presence of any LED on a bike should affect any normal filament type bulb though.....there's no phenomenon (do do da do doo) associated with LEDs that I know about that would cause that
    सत्यमेव जयते

  6. #6
    Subscriber Click here to find out how to Subscribe
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    Jan 2014
    Barnsley, England
    The brightness of LED lights is controlled with "Pulse Width Modulation" which basically means they turn the LED on and off a number of times a second, the longer the pulse the brighter the LED. This is technology is used on regular lamps also and can massively increase the lamp life, it been used on cars for many years. If you are getting lots of blown headlamps consider the quality of the lamp your fitting and make sure you don't have any poor connections on the lamp holder.

  7. #7
    Subscriber Click here to find out how to Subscribe
    Join Date
    Sep 2012
    Torbay, England

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    You can get LED dimmers that allow non multiplexed LEDs to be dimmed or rather show reduced intensity the light colour remains the same. The appear to flash on video unless the dimmer is turned off.

    This does 4 amps more than enough for most bike size LED spots/floods on the market -
    08 R1200GSA
    76 Suzuki GT750

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