Phoenix's Outdoor Lighting: The Rules That Matter

Every city handles outdoor lighting a little differently. In Phoenix, Arizona, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Light Trespass & Shielding

Phoenix requires most outdoor light fixtures to be fully shielded so light does not spill onto neighboring property or scatter into the night sky.

Key details: Governing section: City Code § 23-100. Shielding standard: Light below horizontal plane. Curfew exception: Off 11 PM-sunrise avoids shielding. Mercury vapor fixtures: Banned if installed after 1985. Pre-1985 fixtures: Exempt from these rules.

Enforced under City Code Ch. 23; unshielded high-intensity fixtures (sodium, metal halide, quartz, large incandescent) violate § 23-100.C unless on an 11 p.m.-sunrise automatic shutoff. Mercury vapor fixtures installed after 1/1/1985 are prohibited outright.

Billboard Lighting

Off-premise billboards in Phoenix may be lit but must dim after sunset and go dark from 11 p.m. to sunrise under the Zoning Ordinance.

Key details: Illumination type: Internal, indirect, or direct allowed. Evening dimmer cap: 300-342 nits, sunset-11pm. Nighttime curfew: Off 11pm to sunrise. Emergency exception: Amber Alerts only. Shielding rule: Per City Code § 23-100.

Zoning Administrator enforcement; noncompliant or unshielded illumination is a sign-code violation subject to correction, permit revocation, or removal as a nonconforming/illegal sign.

Dark Sky Rules

Phoenix requires most outdoor light fixtures to be fully shielded downward, and metal halide or fluorescent fixtures must also be filtered, unless the light auto-shuts off overnight.

Key details: Rule: Full shielding required, most fixture types. Filtering required: Metal halide and fluorescent lamps. Curfew exception: Auto shutoff, off 11 PM-sunrise. Banned fixture: Mercury vapor, since Jan. 1, 1985. Grandfathered: Fixtures installed before 1985.

No fine amount is codified in § 23-100 itself; enforcement runs through the City's general code-violation process, with the Zoning Ordinance's separate lighting standards enforced by Planning & Development.

The Bottom Line

Phoenix's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Phoenix is broadly strict or permissive.

This guide is based on Phoenix's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.