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Solid-State Roadway Lighting Design Guide: Volume 1: Guidance (2020) / Chapter Skim
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Chapter 11 - Potential Environmental Impacts
Pages 55-58

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From page 55...
... However, using CCT as a defining metric for determining harmful health effects from LED lighting is not accurate, because CCT is not the only factor involved in defining light exposure (Rea and Figueiro 2016)
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From page 56...
... Defense Meteorological Satellite Program, and light exposure was not measured at an individual level. Research also has showed that there is no relationship between light levels estimated from satellite imagery and light levels experienced by individuals (Rea et al.
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From page 57...
... can be used to calculate the activation of each of the receptors, which can help in comparing the light sources of different SPDs. Research that evaluated the effect of the duration of exposure and the light level from 3000K and 4000K LEDs on melatonin suppression shows that melatonin suppression was The spectral content of LEDs can have significantly affected by the duration of exposure and the light level an impact on light scatter, potentially (Lighting Research Center 2016)
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From page 58...
... Although impacts and considerations may further develop as more data are analyzed, the following key items are recommended for design. • A well-designed roadway lighting system that uses the recommended light levels and meets the glare limits and light trespass values specified in the AASHTO Roadway Lighting Design Guide does not have any adverse health effects when typical 3000K or 4000K LED sources are used.
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Key Terms

  • light source
  • blue content
  • light levels
  • light trespass
  • sky glow

  • melatonin suppression
  • led light
  • light sources
  • led roadway
  • lighting design

  • circadian rhythms
  • blue light
  • led sources
  • circadian light
  • light level

  • human circadian
  • lower blue
  • spectral content
  • circadian response
  • aashto roadway

  • content resulted
  • shorter wavelengths
  • satellite imagery
  • light values
  • limited light

  • light scatter
  • specific light
  • light emitted
  • recommended light
  • light exposure


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