Dark Sky Rules: Green Valley vs Marana
How do dark sky rules rules compare between Green Valley, AZ and Marana, AZ?
Green Valley and Marana 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 →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 →Key Facts Comparison
| Fact | Green Valley | Marana |
|---|---|---|
| Max Color Temp | 3000K (warm white only) | - |
| Shielding | Full-cutoff required all fixtures | Full cutoff required (all fixtures) |
| Observatory | Kitt Peak protection zones | - |
| Code Chapter | 18.81 Outdoor Lighting | - |
| First Adopted | 1974 (updated multiple times) | - |
| Mercury Vapor | - | Prohibited |
| Lumens/Acre | - | Limited by zone and observatory proximity |
| Reason | - | Kitt Peak and regional observatories |
| County Authority | - | Pima County Outdoor Lighting Code |
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.
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.
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