Exterior illumination designed to minimize light pollution is a key aspect of responsible lighting practices. These systems are engineered to direct light downwards, shielding the source and preventing light from scattering upwards into the night sky. An example of such a system would be a fully shielded outdoor fixture with a warm color temperature (e.g., below 3000 Kelvin) used for illuminating a walkway.
The utilization of these lighting strategies offers numerous advantages. Reducing light trespass improves visibility by minimizing glare and skyglow, enhancing nighttime views and supporting astronomical observation. This approach also conserves energy by directing light only where needed, minimizing wasted illumination. Historically, concerns about wasted energy and the negative impact on nocturnal wildlife have driven the development and adoption of these lighting solutions.