Not to be taken lightly

The problems associated with coupling tractive units to trailers with light emitting diode (LED) rear lamps are described. The electrical system of a modern truck cannot recognise the existence of an LED. Flexible Lamps has come up with a solution in the form of the M756 rear lamp. This is claimed to be the first rear lamp designed from scratch around LEDs. The lamp only measures 30mm from front to back and has a cast aluminium back-plate to which the polycarbonate lens is sealed. The lamp contains 80 individual LEDs and a microprocessor that controls the lamp's response. The electronics were designed by Actia (UK). The impedance of the LED circuits is controlled to make the tractor unit think there are normal bulbs there. A resistor is integrated into the aluminium back-plate. The ways in which the electronics interact with the direction-indicator and trailer-sensing functions of the truck are described. A pair of M756 lamps cost approximately £300. (A)


  • English

Media Info

  • Pagination: 18-19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01043740
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Mar 9 2007 8:14AM