Alternative Lighting Evaluations in Municipality of Anchorage

The City of Anchorage installed five alternative lighting systems along a commercial street in Anchorage, Alaska. The systems include 250W High Pressure Sodium (HPS), 146W to 234W light-emitting diode (LED), and 165W induction technologies. Each of the installations was evaluated for public perception, visual performance, and photometric performance. In addition, an existing section containing non-dimmable 400W High Pressure Sodium luminaires was evaluated. The performance data was measured through a Roadway Lighting Mobile Measurement System (RLMMS) that collected visibility detection and illuminance data. The public preference data was collected using a questionnaire that asked the evaluators to rate the lighting systems on several key aspects. In total, 80 members of the public completed the survey and 27 members of the public completed the visibility experiments.The detection distance results suggest that the alternative lighting systems do not perform as well as the existing 400W HPS system. All of the alternative lighting systems had shorter mean detection distances than the existing system. However, the results show that when compared to the 250W HPS installation, the broad-spectrum sources produced longer detection distances. It is noteworthy that the decrement in the detection distance among the various alternative lighting systems is not proportional to the decrement in the illuminance. The public perception of the lighting systems shows that the broad-spectrum sources are more readily accepted than the existing lighting system. These differences and the influence of alternative lighting technologies are discussed in detail.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Tables;
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152941
  • Record Type: Publication
  • Report/Paper Numbers: 10-2745
  • Files: TRIS, TRB
  • Created Date: Mar 23 2010 6:46AM