L.E.D headlight on original 6v system

[highboy_coupe]

Hi, I recently installed indicators and an L.E.D headlight bulb on my B40F, to reduce the load on the system and get something better than a candle to light my way at night!
Perhaps because of the rather rudimentary electrical system on the bike, I am experiencing some strobing worthy of a dodgy nightclub! Has any fitted an led bulb? I believe something like a 9v  10k> capacitor in parallel with the bulb would smooth things out, that's a stab in the dark, excuse the pun!

[scifi]

Had the same strobing with my C11, and thought I would try a smoothing Capacitor, but could not find a suitable place to fit one somewhere on the 6v negative line.    I did touch the capacitor across the battery, but that did not stop the problem.   I think the voltage spikes from the dynamo somehow affect the inbuilt power regulator of the LED.   So I went back to the old style bulb.

[cdsdorset]

Are you using an electronic reg/rec?

[scifi]

I don't know if you are asking me, but yes I was using an electronic regulator in the old relay box, which I have now renewed with an encapsulated one.

[highboy_coupe]

Thanks guys,  I have not moved to a reg/rec yet. Just the standard 6v system at the minute.  I'll try a capacitor in parallel near the bulb to see if that makes any difference, and then just go back to a standard bulb!!

[maddogmargetts@yahoo.co.u]

thats interesting as I fitted a LED headlight onto the M21 and i have not seen any problems at all. Does it strobe
on low revs or all the time? The light is definitely worth persevering with because mine makes a big difference.
Sounds like what one of the other guys said in his comments about uneven charge from the dynamo which is why
i asked if it happened through the full rev range.

[DAVE BRADY]

Hi,

It may be worth speaking to Paul Goff who supplies LEDs and lot of other electrical stuff.   01494 868218

Dave.

[highboy_coupe]

Hi, thanks.

I have switched to 12v now and fitted a modern reg/rec
It was strobing all the tim bit pulsing in time with revs. It's a 65 B40 so no dynamo. 


I suspect it was just a badly controlled LED, they should have build on capacitors to smooth their operation but I may have purchased a crappy one.  I will look at the better 12v options.

[cdsdorset]

Have a chat to Al at AO services.

[Derek996]

I think the strobing may have something to do with the rectified ac not being being sufficiently smoothed. A largish capacitor should smooth out any ac ripple although I'd have thought the battery would help with  that. I run 12V from a dynamo, which has been fully converted to 12V, with a Vreg-2A regulator. All the lights are LED with no strobing whatever.