Navajo County, AZ Outdoor Lighting: Light Trespass & Shielding (2026)

Section 1803 lists five specific prohibitions under Article 18's outdoor lighting ordinance, moving from the general aim-and-shield standard in Section 1802 to outright bans on particular lighting practices. Item 1 bans operating a searchlight for advertising purposes at all. m. Item 3 bans unshielded illumination of a building, landscaping, or sign except with small fixtures, incandescent bulbs under 150 watts or LED fixtures under 25 watts. Item 4 bans mercury vapor fixtures outright, with no exception. Item 5, the neighbor-facing rule, prohibits light produced on one property from affecting a neighboring property in a way that adversely affects activities there or causes unreasonable interference, an outcome-based test that applies even to an otherwise-shielded fixture if its glare or spillover still reaches across the property line.

5 judges the fixture by its actual effect on the neighbor, so a complaint can succeed even if the fixture technically has a shield, as long as it still adversely affects the neighboring use.