Using light emitting diodes in traffic signals : final report.

Details

• Creators:
  Edgar, Rob ; Close, C.
• Corporate Creators:
  Oregon. Dept. of Transportation. Research Unit
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Light emitting diodes
  • Traffic signals
  • Testing
  • Performance
  • Lamps
  • Costs
  • Service life
  • Reliability
  • LED
  • light emitting diode
  More +
• Publication/ Report Number:
  FHWA-OR-RD-99-04
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Unit
• Abstract:
  In 1993, the Oregon Department of Transportation (ODOT) began testing red light emitting diodes (LED's) as a replacement to the incandescent lamps in vehicular and pedestrian signals. Field performance was found to be reliable and subsequently ODOT began replacing all red incandescent lamps. In 1995, an implementation program was created to introduce Oregon cities and counties to the LED lamps. The program installed 2,212 red LED lamps used in 12" balls, 12" arrows, 8" balls and pedestrian "hand" symbol. ; The red LED lamps reduced power consumption by 88%. Operating costs, including power and annualized lamp replacement costs, were reduced 26%. The LED lamps are warranted to last 5 years and have an estimated payback of 3.6 years. The 12" lamps, which typically have about 620 individual LED's, continue to operate after several of the LED's have failed -- thus making the LED lamp more reliable. The higher reliability and longer life has reduced the number of emergency calls for lamp failures.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/22442/dot_22442_DS1.pdf
• File Type:
  [PDF - 1.13 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:4954e830d592de7a238f454cd3d3de9775d514f448e493c0270a4a076ed24346b2a1e8f99e01d47355dc98bdfd9abdfc500db542de8aaaf757488b26369bc7fb