BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
Chris Newport
Chris Newport
San Jose, CA USA
Posts: 27
Joined: May 2008
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
202 registered members (2ndchildhood), 1,712 guests, and 683 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Robert Jones, Richard baynham, 666Diogenes, Mick56, Peter somers
9743 Registered Users
Top Posters(30 Days)
Stuart 78
Lannis 68
desco 56
Popular Topics(Views)
360,301 mail-order LSR
Forum Statistics
Forums33
Topics64,039
Posts619,014
Members9,743
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Follow BritBike here!
Previous Thread
Next Thread
Print Thread
Rate This Thread
#701134 - 07/08/17 6:41 pm LED question  
Joined: May 2009
Posts: 261
Paul Sammut Offline
BritBike Forum member
Paul Sammut  Offline
BritBike Forum member

Joined: May 2009
Posts: 261
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
Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#701178 - 07/09/17 7:17 am Re: LED question [Re: Paul Sammut]  
Joined: Jan 2014
Posts: 3,076
NickL Offline
BritBike Forum member
NickL  Offline
BritBike Forum member

Joined: Jan 2014
Posts: 3,076
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: 261
Paul Sammut Offline
BritBike Forum member
Paul Sammut  Offline
BritBike Forum member

Joined: May 2009
Posts: 261
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: 1,486
quinten Online content
BritBike Forum member
quinten  Online Content
BritBike Forum member

Joined: Sep 2013
Posts: 1,486
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
Posts: 3,076
NickL Offline
BritBike Forum member
NickL  Offline
BritBike Forum member

Joined: Jan 2014
Posts: 3,076
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: 2,034
Morgan aka Admin Online happy
Ride safe today!
Morgan aka Admin  Online Happy

Ride safe today!

Joined: Jul 2001
Posts: 2,034
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


Moderated by  John Healy 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.233s Queries: 15 (0.015s) Memory: 0.8233 MB (Peak: 0.9798 MB) Zlib disabled. Server Time: 2017-07-22 18:55:48 UTC