LED2 SIGNAL LAMPS: THE NEW STANDARD?

Although light-emitting diode (LED) traffic signal lamps are durable and save energy, their introduction is being delayed by their complexity and high cost. The Dutch Ministry of Transport (Rws) uses many signal lamps, on inland waterways as well as roads. Shipping signals are an ideal test case for LED signal lamps. The Rws wants to restrict the uncontrolled growth of the number of types of LED signal lamps. For this reason, it has chosen the LED2 (low voltage enclosed dimmable) signal lamp as its standard, in conjunction with manufacturers, users, and qualification designers. This article discusses some current LED lamp problems. It also describes LED2 signal lamps, which will be applied in 2000 in a few trial projects; in 2001, the Rws will be supplied with the lamps on a larger scale. Several makes of these lamps will also be shown at the Intertraffic 2000 exhibition. A table in the article compares the properties of signal lamps with incandescent bulbs with those having LEDs. LED lamps are brighter than bulb lamps, but can be dimmed much more easily. Problems related to introducing LED lamps of the present type include maintenance, new standards, and difficulty of monitoring red lights. The LED2 LED has low voltage (48V or 42V), enclosed electronics to guarantee constant quality, and is easily dimmable.

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  • Corporate Authors:

    UK and International Press

    Abinger House, Church Street
    Dorking, Surrey  United Kingdom  RH4 1DF
  • Authors:
    • ZANDVLIET, W P
    • VAN GELDERMALSEN, L A
  • Publication Date: 2000

Language

  • English

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Filing Info

  • Accession Number: 00795171
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 7 2000 12:00AM