2 county-level rules, plus city-specific rules for 1 city in Arapahoe County, Colorado.
Verified from official government sources
Arapahoe County Land Development Code §5-4 requires fully-shielded (full-cutoff) outdoor lighting for new installations. Aurora UDO §146-4 and Centennial §12-11 require similar. Cherry Hills Village has particularly strict dark-sky rules to preserve rural character. LED color temperature 3000K or below preferred. DIA affects nearby lighting.
Unincorporated Arapahoe County's Land Development Code Section 4-400 regulates exterior lighting. Fixtures must be fully shielded and directed downward, with illumination levels limited at the property line to prevent light trespass onto adjacent residential properties.
1 cities in Arapahoe County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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