Yuma's Outdoor Lighting: The Rules That Matter

Every city handles outdoor lighting a little differently. In Yuma, 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.

Dark Sky Rules

Yuma's outdoor lighting chapter states its purpose in dark-sky terms: reducing waste, glare, light trespass and effects on wildlife under Arizona's Title 49 light-pollution statute while preserving night-time safety and the visibility of the night sky. The city backs that goal with concrete fixture rules, including shielding, LED color-temperature caps and a ban on mercury vapor lamps. City Code § 154-18.01 states the standard.

Key details: Governing state law: A.R.S. Title 49, Ch. 7, Light Pollution. Preferred light sources: LED and low pressure sodium. Max LED color temp: 3,000 Kelvin for commercial use. Mercury vapor lamps: Prohibited outright. Shielding exemption: 70 watts (700 lumens) or less.

Installing outdoor lighting that ignores the shielding, color-temperature or mercury-vapor ban in § 154-18.02 without an approved Zoning Administrator deviation is enforced under the chapter's general penalty, § 154-999: a class 1 misdemeanor punishable by up to a $1,000 fine, up to ten days in jail, or both, with each day a noncompliant fixture keeps operating counted as a separate offense.

Light Trespass & Shielding

Yuma defines light trespass as artificial light from a fixture on one property that is directed so the light source itself is visible from another property, and it prohibits that condition outright except for fixtures the code specifically exempts. Light poles within 25 feet of a residential use are also capped at 12 feet, and commercial permits must prove no trespass onto neighbors. City Code § 154-18.02 governs.

Key details: Light trespass: Prohibited under § 154-18.02(R). Definition: Light source visible from another property. Pole height near residential: 12 ft within 25 ft of residence. Upward lighting angle limit: 45 degrees from horizontal. Commercial permit requirement: Photometric survey proving no trespass.

A property owner whose fixture casts a visible light source onto a neighboring parcel is in violation of § 154-18.02(R) and subject to the chapter's general penalty, § 154-999: a class 1 misdemeanor carrying up to a $1,000 fine, up to ten days in jail, or both, with continuing daily violations charged as separate offenses until the fixture is shielded or removed.

Billboard Lighting

Yuma requires billboard lighting fixtures to sit on top of the sign structure and be shielded, and bans ground-mounted up-lighting unless it is confined to the sign face at no more than a 45-degree upward angle. Outdoor advertising off-site signs, including internally lit faces, must go dark between midnight and sunrise. City Code § 154-18.02 sets these fixture and curfew rules.

Key details: Fixture mounting: Must be top-mounted on sign structure. Ground up-lighting: Prohibited unless shielded to sign face. Max upward lamp angle: 45 degrees from horizontal. Illumination curfew: Off from midnight to sunrise. Mercury vapor lamps: Prohibited for outdoor lighting.

Installing an unshielded ground-mounted billboard light, running upward lighting beyond the 45-degree limit, or leaving an off-site sign illuminated past midnight violates § 154-18.02 and is enforced under the chapter's general penalty, § 154-999: a class 1 misdemeanor carrying up to a $1,000 fine, up to ten days in jail, or both, with each continuing day of violation treated as a separate offense.

The Bottom Line

Yuma'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 Yuma is broadly strict or permissive.

All of the above reflects Yuma's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.