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Wig Wag and LED's

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selwyn

Joined: 12 Mar 2008
Posts: 102
Location: Australia

Posted: Mon Jul 21, 2008 1:47 am Post subject: Wig Wag and LED's

I'm planning the set up of a wig wag flash system on my forward lights using the B&C SSF1 unit.  I notice that this unit will switch up to 150 W and that it requires a load on each leg to function.  I am wondering what the minimum value for the load is as I am planning on using LEDs of around 4 or 5 W for each light.  Will this unit function correctly with loads such as this?



Cheers,  Selwyn.

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nuckolls.bob(at)cox.net
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Posted: Mon Jul 21, 2008 6:02 am Post subject: Wig Wag and LED's

At 02:47 AM 7/21/2008 -0700, you wrote:

 	  Quote: 	
		  



I'm planning the set up of a wig wag flash system on my forward lights 

using the B&C SSF1 unit.  I notice that this unit will switch up to 150 W 

and that it requires a load on each leg to function.  I am wondering what 

the minimum value for the load is as I am planning on using LEDs of around 

4 or 5 W for each light.  Will this unit function correctly with loads 

such as this?



Cheers,  Selwyn.


	


    That's a damned good question my friend . . . and I

    don't know. Those electronic automotive flashers are

    certainly much less sensitive to load changes than

    their thermo-mechanical ancestors but I've never

    explored the necessary minimum load to not affect

    functionality.



    Leds are very different than incandescent lamps.

    An LED biased up with microamps across it drops

    voltage almost the same as when running full bright.

    I'm fairly sure that the electronics in that flasher

    are looking for "nearly ground" through an un-energized

    filament to function properly.



    When push comes to shove, you can probably parallel

    one of the lamps with a resistor that might need to

    be on the order of 30 ohms (about 3 watts of 'wasted'

    power) to keep the flasher happy. You can experiment

    with this on the bench. In any case, the final configuration

    will still be MUCH less energy needy in spite of the

    idiosyncrasies of the automotive electronic flasher.



        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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