Arizona regulates outdoor lighting statewide through the Outdoor Light Control statutes, requiring shielded fixtures and limits on certain lamp types, particularly in counties hosting major astronomical observatories.
ARS 49-1101 through 49-1105, the Outdoor Light Control Act, restricts outdoor lighting types and fixture designs across Arizona. The statute prohibits the sale or installation of unshielded outdoor mercury vapor luminaires and regulates other lamp types to reduce light pollution. Pima, Cochise, Santa Cruz, Yavapai, Gila, Graham, and Maricopa counties have additional restrictions because of nearby observatories such as Kitt Peak and Mount Graham. State-permitted exemptions include public safety, emergency, and certain commercial signage uses. Cities and counties enforce the act in coordination with state law.
Violations can result in civil penalties; non-compliant fixtures must be replaced or shielded, and sellers may face penalties for distributing prohibited luminaires.
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