A white LED front light

This is a short description of how to change the front light bulb for a white LED circuit.

This circuit pros :
• Replace the original Wedge Base bulb, no need to change the socket or the wiring.
• Very long lifetime : more than 100 000h (10 years).
• Vibration-proof.
• High efficiency, power consumption is reduced by 80%.
• Few heat is produced.
• Extra-white light, sometime lightly blue.
• Light flux slightly higher than with a standard 5W bulb.

This circuit cons :
• Overall cost may be high due to the price of the white LEDs, depending of the sourcing.
• Side viewing of the front light may be difficult, more than with the original bulb.

Schematic & Board

(image) (image)


• 4 x 180 ohms resistors 5% 1/4W.
• 12 x hight intensity white LEDs (or 6 depending of the efficiency).
• 2 x 1N4001 diodes or similar rectifier (min 50v / 1A).
• 2x round connectors 10mm x 2mm to be inserted in the Wedge socket.
• Epoxy PCB or pre-drilled board.

All components are standard and may be purchased at any electronic component shop.
Overall cost : less than 3€ without the LEDs (price may vary a lot).

Be carefull : diodes & LEDs are polarized components & sensitive to soldering overheat.
Diodes 1N4001 go on copper side.
All resistors stand verticaly.
The PCB shape is sensible : it must fit on the Wedge socket. Adjust with a set of thin files.
The circuit is polarity sensible. If it does not work, put it reversed on the socket.
A good idea is to paint the pcb in white or put a white self-adhesive label before soldering components. I forgot to do it !



This circuit will probably fail the MOT, use it under your own responsibility.


Please enter your account details

Lost account details×

Enter your e-mail to receive your account details



Why sign-up ?

  • It's free but you can make a donation.
  • You gain access to fonctionalities otherwise not available.
  • It will boost your sex-appeal and allow you to time-travel.

How to sign-up ?

Username Required - 3 to 20 letters or digits
Password Required - 6 to 20 letters or digits
E-mail Required - enter a valid E-mail address

My account×

Modify my password

Current password

New password
Confirm new password

Modify my E-mail

Current E-mail

New E-mail
Confirm new E-mail

Delete my account

Current password

Add messageEdit message×
  • Your comments, feedback and suggestions are welcome !
  • Please use forums for any questions requiring a quick answer.
  • Your questions should relate to the TDM / XTZ / TRX only.
  • No links, ads, sales, doc requests. Thanx.
  • Edit your message then click the 'Ok' button.
  • An empty message will be deleted.
Name Required - 3 to 20 letters or digits
E-mail Optional - will be encrypted
Country Optional


Terms of Service and Privacy Policy×

Collection & use of your personal information

When registering to the site, you will be asked personnal informations such as your e-mail address, your country of origin, etc. This site will not provide or sell your personal information to a third party without your consent.

The site may collect information about your visit in order to operate and improve the site and the service it delivers. This includes the pages you view, the links you click and other actions taken in connection with the site. It also collect certain standard information that your browser sends to every website you visit, such as your IP address, browser type and language, access times and referring Web site addresses. Theses data is collected only for statistical usage and will not be used for any other purpose. This data is periodicaly erased (max 3 months).

Use of cookies

This site uses cookies to memorize your display language option and your session data. No personnal information is stored into the cookies. If your browser does not accept cookies, you will not be able to change language or open session.

Use of e-mail address

This site will not sell, lease or rent the e-mail you provide while registering or posting messages. E-mail addresses will not be used for any purpose other than sending you service e-mails : registering confirmation, updating your data or requiring a new password.


This site does not allow any messages containing :

  • Spam : repeated (commercial) messages.
  • Referral Programmes or Pyramid Schemes (links to websites through which you have a personal gain).
  • Rude and disrespectful behaviour, whether it is to members of this site or the staff of this site.
  • Language that is obscene, vulgar, sexually orientated, hateful, threatening or violate any laws.
  • Offerings of products (tangible or intangible) and services that you do not have legal disposition over.

This site reserves the right to edit or delete reactions and to ban any user violating the rules without notice. Freedom of speech is a right, however this does not mean we are obliged to publish your opinion.

This policy is subject to change without prior notice.




Send SMS×
Name Required - 3 to 20 letters or digits