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Streetlight designers must balance visibility with the growing concern over light —pollutionpollutingpollutantpolluted, which disrupts nocturnal wildlife and obscures the night sky. Shielded fixtures direct illumination downward onto the pavement instead of scattering it —sidewayssidewisesidedsiding, cutting wasted energy considerably. Councils increasingly favour dimmable LED units that can be adjusted —remotelyremoteremotenessremoved depending on pedestrian traffic, rather than burning at full —brightnessbrightbrightenbrightly all night.