LED board for Lucas L542 lamp RED AMBER suits 289 and 427 AC Cobra

In stock

Red / Amber Stop, Tail and Indicator LED board

fits Lucas L542 lamp

Shines Amber through Red lens,  12V  negative earth



Installation guide.pdf (100 Kb)

Installation guide.pdf (100 Kb)

Replaces steel backplate in L542 lamps

  • 12V negative earth Indicator and stop / tail
  • 8 x 1.0 Watt Amber LED for Indicator
  • 5 x 1.0 Watt Red LED for Stop / Tail
  • Stop lamps under driven for tail light
  • This board shows Amber indicator through Red lens
  • (indicator and brake light functions are swapped for maximum direction indicator brightness)
  • Aluminium circuit board for heat dissipation
  • Reacts faster than an incandescent bulb. (LEDs reach full brightness almost instantaneously, Incandescent bulbs can take 1/5 second)


Very Low Profile requires minimal hole in the body panel

Fits original holes, but does not require a large cut out in the panel if fitting to a new, pattern or kitcar panel

Fits into original lens and trim and will require some dismantling of the original lamp, we have been careful to design the board so that the four smaller tabs holding the trim to the lens do not need to be bent back, please read the instructions carefully before attempting to fit. Will require the fitting of a brake light wire for vehicles with a Lucas DB10 relay unit. We offer the correct colour cable as an optional extra.


these units use special Amber LEDs more than twice the brightness of our other rear lamps to show a good amber through the red lens. They work well with all but the darkest of red lenses. Excellent results are obtained with the SVC lenses.

The units are built onto aluminium circuit boards to dissipate the extra heat generated by all those LEDs!

Fitting LED lights will affect the flash speed of older bimetal flasher relays. Optional extras on this listing are hybrid flasher relays to correct this problem. They will flash at the correct speed with any combination of bulbs and LEDs. A hybrid flasher with built in buzzer is available also. OEM Flashers are two pin, the Hybrid flasher is three pin, requiring an Earth (ground) connection. For your convenience, we offer a black lead with suitable connectors as an optional extra.


*  notes,

we do not expect the LEDs to fail, but it would be stupid to ignore the possibility so we are making a set of two of each colour available to put in a drawer and forget.

The original Aces, prior to Cobra production, used the rectangular Lucas L542 rear lights, which were borrowed from the Hillman Minx - the same lights were also used on some Jensens and London taxis. This type continued to be used on the 289 , nearly all the 289 Mklls, the 289 FIA, the early 427 Mkllls and all 427 SCs. LaterMkllls and a few of the lastMklls were fitted with lights borrowed from the Hillman Imp. These lenses are road legal on vehicles first registered before 1974

If you have round lamps and want to know if this lamp will cover the fixing holes, print the template below.

this is scanned from an actual lamp and should be primnted so that the shape is the dimensions given


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