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#701134 - 07/08/17 6:41 pm LED question  
Joined: May 2009
Posts: 269
Paul Sammut Offline
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Paul Sammut  Offline
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Joined: May 2009
Posts: 269
Omaha, NE, USA
Hi all,
I fully admit complete ignorance about LEDs, apart from the great ability to emit light for less energy draw. Since I installed an Alton generator on my C Rapide, I felt it was time to switch to a 12 volt system. I ordered an LED circuit made specifically to fit inside the Miller "STOP" light receptacle and was about to install it when I noticed on the package a box checked "6 volts". Unfortunately, the company I bought it from appears to have folded - or at least the website (bulbsthatlast4ever.com) has disappeared. My question, therefore, is: will this light work in a 12 volt system? Will I rapidly destroy it? Does fitting a resistor in series make it suitable? Any other way I could make it work?
Thanks in advance,
Paul.


Paul

'74 Commando
'75 T160 Trident
'15 R1200 GS Adv
'51 Vincent Rapide
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#701178 - 07/09/17 7:17 am Re: LED question [Re: Paul Sammut]  
Joined: Jan 2014
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NickL Online content
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NickL  Online Content
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Aus
The simple answer is yes, but,,,,,, it's best to measure the current the panel draws on 6 volts first.
Then you can calculate the value and power rating of the resistor.

Another way is to put a small zener in series with the existing setup 6.2 volt 5 watt will be fine in 99% of instances.
Cathode (bar marking across the plastic of the zener) must face positive supply. It can be in either line.

you would be able to get one at a Radio Shack etc. cost about $1.00

Nick

Last edited by NickL; 07/09/17 7:18 am.


#701203 - 07/09/17 2:00 pm Re: LED question [Re: Paul Sammut]  
Joined: May 2009
Posts: 269
Paul Sammut Offline
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Paul Sammut  Offline
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Posts: 269
Omaha, NE, USA
Thank you so much, Nick. I shall do that. Now to find a Radio Shack that still exists......
Paul


Paul

'74 Commando
'75 T160 Trident
'15 R1200 GS Adv
'51 Vincent Rapide
#701235 - 07/09/17 6:11 pm Re: LED question [Re: Paul Sammut]  
Joined: Sep 2013
Posts: 1,583
quinten Online content
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quinten  Online Content
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Joined: Sep 2013
Posts: 1,583
Pacific northwest
Originally Posted by NickL
The simple answer is yes, but,,,,,, it's best to measure the current the panel draws on 6 volts first.
Then you can calculate the value and power rating of the resistor.

Another way is to put a small zener in series with the existing setup 6.2 volt 5 watt will be fine in 99% of instances.
Cathode (bar marking across the plastic of the zener) must face positive supply. It can be in either line.

you would be able to get one at a Radio Shack etc. cost about $1.00

Nick


Running a resistor or zener , to drop 6 volts , does not appear to be very efficient
And Kind of defeats the point of using LEDs as a power saving strategy .
How about using 2 cheap buck converter boards , 99cents each , shipped from HK , instead ?

Before doing anything , Check the light- board , with your best glasses ,
for any specs or documentation that may be printed on it .

#701262 - 07/09/17 9:59 pm Re: LED question [Re: Paul Sammut]  
Joined: Jan 2014
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NickL Online content
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NickL  Online Content
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Aus
The forward voltage of a typical red LED is around 1.8v so the board will already have a resistor on it, ideally that resistor would be changed. (probably awkward)
A small zener can be soldered onto the supply wire and placed inside heatshrink tube, so it's easy quick and simple.
Placing a small SMPS unit on the light unit is rather over the top given that consumption is probably only 100ma or so maximum (zener dissipation 6.2 x 0.1 = 0.62W)
Power consumption is still much less than an incandescent lamp.



#702000 - 07/17/17 11:14 am Re: LED question [Re: Paul Sammut]  
Joined: Jul 2001
Posts: 2,087
Morgan aka Admin Online happy
Ride safe today!
Morgan aka Admin  Online Happy

Ride safe today!

Joined: Jul 2001
Posts: 2,087
Gothenburg, Sweden
yes it would fit both 6v and 12 if i recall correct you alter this by switching a Connection.
I have one for L564 and one for a later A65 mod.
go back and check the instrucuction leaflet


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