Changes in night sky brightness after a countywide LED retrofit.

  title={Changes in night sky brightness after a countywide LED retrofit.},
  author={Li-Wei Hung and Sharolyn Anderson and Ashley R. Pipkin and Kurt Fristrup},
  journal={Journal of environmental management},
The US National Park Service (NPS) Night Skies Program measured changes in sky brightness resulting from a countywide lighting retrofit project. The retrofit took place in Chelan County, a gateway community to North Cascades National Park and Lake Chelan National Recreation Area in Washington State. The county retrofitted all 3693 county-owned high pressure sodium (HPS) street lamps to full cutoff LEDs. This number is about 60% of the County's total outdoor street and area lights. About 80% of… Expand
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