Dark Sky Rules: Marana vs Oro Valley
How do dark sky rules rules compare between Marana, AZ and Oro Valley, AZ?
Marana and Oro Valley have similar restriction levels.
Marana, AZ
Pima County
Marana follows Pima County outdoor lighting code standards designed to protect dark skies and support astronomical observation. All outdoor lighting must be fully shielded and directed downward. Pima County dark-sky rules are among the strictest in the nation.
View full Marana rules →Oro Valley, AZ
Pima County
Oro Valley enforces one of Arizona's strictest dark-sky codes: full-cutoff fixtures, 3000K max color temperature, and shielding on all exterior lighting to protect Catalina foothill skies.
View full Oro Valley rules →Key Facts Comparison
| Fact | Marana | Oro Valley |
|---|---|---|
| Shielding | Full cutoff required (all fixtures) | - |
| Mercury Vapor | Prohibited | - |
| Lumens/Acre | Limited by zone and observatory proximity | - |
| Reason | Kitt Peak and regional observatories | - |
| County Authority | Pima County Outdoor Lighting Code | - |
| Fixture Type | - | Full-cutoff required -- no uplight |
| Color Temperature | - | 3000K maximum |
| Residential Lumen Cap | - | Approximately 10,000 lumens |
| Security Lighting | - | Motion-activated, 10-minute shutoff |
| Commercial Curfew | - | 50 percent reduction after 11 PM |
Highlighted rows indicate differences between cities.
Marana FAQ
Does Marana have dark sky lighting rules?
Yes. Pima County dark-sky regulations apply in Marana, requiring all outdoor lighting to be fully shielded and directed downward. Mercury vapor fixtures are prohibited.
Why are Marana lighting rules so strict?
The Pima County region hosts Kitt Peak National Observatory and other astronomical facilities. Dark-sky rules protect scientific observation and reduce light pollution.
Oro Valley FAQ
What kind of outdoor lights can I install in Oro Valley?
All fixtures must be fully shielded (full-cutoff) with no light emitted above horizontal. Color temperature must be 3000K or lower (warm white or amber). Cool white and daylight LED bulbs are prohibited for exterior use.
Can I put up landscape uplights in my yard?
No. Uplighting of any kind -- trees, buildings, architectural features -- is prohibited under the Oro Valley dark-sky ordinance. All light must be directed downward.
Do the dark-sky rules apply to holiday lights?
The ordinance technically applies to all exterior lighting, but enforcement of temporary seasonal displays focuses on permanent fixtures. Year-round decorative lighting must comply with the full-cutoff and color temperature requirements.
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