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Solid-State Roadway Lighting Design Guide: Volume 1: Guidance (2020) / Chapter Skim
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Chapter 5 - Work Zone Lighting and Temporary Roadway Lighting
Pages 32-35

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From page 32...
... However, LED sources provide benefits and adaptability that includes better control and luminaires that can be better aimed than older HID work zone lighting. LEDs also can cause a higher level of discomfort glare than HID sources, however, which makes optical control and considerations of traffic moving through the work zone an important aspect of such system design.
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From page 33...
... Aimed light sources follow the same orientation guidelines as those for portable light towers. Mount balloon light sources that produce diffused light in all directions at a height of at least 20 feet (6 meters)
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From page 34...
... If the average vertical illuminance level at the measured distances is greater than 1.6 fc, reorient the portable light tower and remeasure the vertical illuminance levels. Continue this process until the mean vertical illuminance level is below the recommended value of 1.6 fc in the critical range to the portable light tower.
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From page 35...
... Use the glare limits included in this document to assess when work zone glare would become an issue.
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Key Terms

  • vertical illuminance
  • portable light
  • zone lighting
  • light tower
  • work zones

  • light towers
  • illuminance level
  • illuminance levels
  • mean vertical
  • light sources

  • average vertical
  • roadway lighting
  • arithmetic mean
  • lighting design
  • lighting levels

  • design guide
  • aashto roadway
  • hid work
  • traffic lane
  • critical range

  • towers mounted
  • minimal lighting
  • quantify glare
  • mean value
  • led light

  • zone glare
  • opposing traffic
  • vertical plane
  • traffic conditions
  • diffused light


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