2 county-level rules, plus city-specific rules for 9 cities in San Diego County, California.
Verified from official government sources
Unincorporated San Diego County has one of the strictest dark-sky laws in the world. The Light Pollution Code (County Code Division 59, commencing at Section 59.101) protects the Palomar and Mount Laguna observatories, defining a 15-mile Zone A and a Zone B, mandating fully shielded fixtures and low-pressure sodium lamps, and requiring most lighting off after 11 p.m.
Unincorporated San Diego County limits light spilling onto neighboring property. Under Zoning Ordinance Section 6324, illumination of adjacent premises by spill light may not exceed 0.2 foot-candles measured inside the adjacent property, and luminaires must be shielded by horizontal cutoff to eliminate light above the horizontal.
9 cities in San Diego County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
2 verified rules • Dark Sky Rules, Light Trespass
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