2 county-level rules, plus city-specific rules for 1 city in Solano County, California.
Verified from official government sources
Unincorporated Solano County has no comprehensive countywide dark-sky lighting ordinance. Instead, Chapter 28 imposes shielding and downcast lighting requirements on specific uses - exterior night lighting must be directed downward and inward, shielded, and aimed away from neighbors and roadways to prevent light pollution and glare.
Solano County Code Ch. 28 (Article III, exterior lighting performance standard)
All exterior night lighting shall be directional lighting that directs the light downward and inward toward the project site so as not to create a nuisance to neighbors.
Unincorporated Solano County controls light trespass through Chapter 28 performance standards. Exterior lighting must be directed away from adjacent properties and public rights-of-way to prevent offensive light or glare, and no glint or glare may be detectable beyond any property line or by overflying aircraft.
Solano County Code Ch. 28 (Article III, lighting performance standard)
Lighting capable of providing adequate illumination for security and safety and directed away from adjacent properties and public rights-of-way to prevent offensive light or glare.
1 cities in Solano County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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