Which sustainability initiative has been most widely adopted by major astronomical observatories to reduce their environmental impact while maintaining research quality?

Light pollution is a growing concern for astronomers worldwide, affecting both professional observatories and amateur stargazers. Many observatories and astronomy organizations have launched sustainability initiatives to combat this issue. This poll tests your knowledge about the innovative approaches being used in the astronomy industry to create more sustainable night sky viewing conditions while balancing community needs.

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Implementation of red-light only policies in observatory surroundings, requiring all outdoor lighting to use red wavelengths that minimally interfere with observations
Installation of full-cutoff LED lighting systems that direct light downward and reduce upward light scatter while consuming less energy
Complete blackout zones extending 50 miles around major observatories where all artificial lighting is prohibited after sunset
Mandatory observatory shutdowns during peak energy usage hours, with research conducted only during renewable energy surplus periods