Dark Sky Rules: Green Valley vs Oro Valley
How do dark sky rules rules compare between Green Valley, AZ and Oro Valley, AZ?
Green Valley and Oro Valley have similar restriction levels.
Green Valley, AZ
Pima County
Pima County has one of the strictest outdoor lighting codes in the United States, adopted to protect Kitt Peak National Observatory and the surrounding Sonoran Desert night sky. The Pima County Outdoor Lighting Code requires full-cutoff shielding on all outdoor fixtures, limits color temperature to 3000K maximum, and establishes stringent lumen caps by zone.
View full Green Valley 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 | Green Valley | Oro Valley |
|---|---|---|
| Max Color Temp | 3000K (warm white only) | - |
| Shielding | Full-cutoff required all fixtures | - |
| Observatory | Kitt Peak protection zones | - |
| Code Chapter | 18.81 Outdoor Lighting | - |
| First Adopted | 1974 (updated multiple times) | - |
| 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.
Green Valley FAQ
What does the Pima County dark sky lighting code require?
All outdoor lighting fixtures must be fully shielded (full-cutoff) with no light emitted above the horizontal plane. Maximum color temperature is 3000K (warm white). Lumen limits vary by proximity zone to Kitt Peak National Observatory. The code is one of the strictest in the nation.
Can I use bright white LED lights outdoors in Pima County?
No. The Pima County Outdoor Lighting Code limits all outdoor fixtures to 3000K maximum color temperature. Cool-white LEDs (4000K-5000K) and daylight LEDs (5000K+) are prohibited for outdoor use. All fixtures must also be fully shielded.
Why does Pima County have such strict lighting rules?
The code protects Kitt Peak National Observatory, one of the worlds most important astronomical research facilities. The observatory is located within Pima County and requires dark skies for optical and infrared observations. The code has been in place since 1974.
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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