What issue may arise from site lighting fixtures that are not cutoff?

The concern with site lighting fixtures that are not cutoff primarily revolves around light pollution onto neighboring properties. Cutoff fixtures are designed to direct light downwards and minimize the amount of light that spills over into unintended areas. When fixtures are not cutoff, they can emit light in all directions, including horizontally and upwards.

This unintended light can result in significant glare and brightness in areas where illumination is not needed or wanted, which not only affects the beauty of the night sky but can also disrupt the quality of life for neighbors due to excessive brightness. Such light pollution can interfere with residential life, wildlife patterns, and even ecosystems in the vicinity. It can also complicate compliance with local lighting ordinances that aim to control light trespass.

While energy efficiency, reduced visibility, and increased security are important aspects of site lighting, they do not directly address the primary issue of light pollution, which is a significant consideration in urban planning and environmental design. Effective site lighting should therefore not only prioritize function but also the well-being of the surrounding community and environment.