"Most of Yellowstone is free of artificial light. However, in developed areas throughout the park there are more than 5,000 light fixtures. In the past, visitors often encountered bright light fixtures illuminating streets and buildings in the park making it difficult to view the natural night sky. Now, light fixtures are being replaced with low wattage, energy efficient, fully shielded fixtures that direct light only downward. Currently, only 46% of light fixtures are on at night and 75% those are fully shielded; helping to further preserve nighttime wilderness."
Geyser Night, Yellowstone National Park
NPS - Neal Herbert
Thursday, September 21, 2023
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