What is Light Pollution

Light pollution is excessive, misdirected, and inefficient outdoor illumination. Examples of light pollution include:

  • Lights shining across property boundaries, such as into a neighbor’s windows
  • Glare–light shining in your eyes
  • Lights shining upward into the sky to add to the general sky glow
  • Using too much light (overlighting)
  • Energy waste, caused by using inefficient (typically outdated) lighting technologies

Learn more from this extensive article by the Lighting Research Center at Rensselaer Polytechnic Institute

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