How many measurements are required for light pollution reduction using the perimeter measurement option?

The requirement for light pollution reduction using the perimeter measurement option involves taking a specific number of measurements at designated intervals around the project site to ensure compliance with the LEED rating system's criteria. The correct option states that 8 measurements are required, with a spacing of 100 feet between each measurement.

Taking 8 measurements ensures a comprehensive assessment of the light pollution levels surrounding the entire perimeter, allowing for sufficient data to evaluate the lighting impact on the surrounding environment. The 100-foot spacing offers a balance, providing detailed coverage while keeping the measurements manageable in terms of both time and resources.

This approach aligns with LEED's goals of promoting sustainable and environmentally friendly practices by minimizing light pollution and its associated negative effects on nocturnal wildlife and human health. The other options, while suggesting a variety of measurements and spacing, do not adhere to the LEED requirements for this particular assessment method. The focus is not only on how many measurements are taken but also on how well they capture the lighting environment across the site.