Dark Sky Rules: Palo Alto vs Sunnyvale
How do dark sky rules rules compare between Palo Alto, CA and Sunnyvale, CA?
Palo Alto and Sunnyvale have similar restriction levels.
Palo Alto, CA
Santa Clara County
Palo Alto regulates outdoor lighting under its zoning code to prevent light pollution and glare, with full cutoff fixtures required for new installations and shielding standards for commercial uses.
View full Palo Alto rules →Sunnyvale, CA
Santa Clara County
Sunnyvale limits outdoor lighting glare and spill through SMC Title 19 and Title 24 Part 6. Fixtures in residential zones must be shielded and not spill onto adjacent properties.
View full Sunnyvale rules →Key Facts Comparison
| Fact | Palo Alto | Sunnyvale |
|---|---|---|
| Core Requirement | Shielded fixtures, no light trespass | - |
| Commercial | Full cutoff required | - |
| Title 24 Part 6 | Energy controls on commercial | - |
| Review Triggers | Sports, parking, large signs | - |
| Historic Areas | Character-specific rules | - |
| Code basis | - | Title 19 + Title 24 Part 6 |
| Fixture type | - | Full-cutoff/hooded |
| Commercial curfew | - | Typically 10 pm - 6 am |
| Holiday lights | - | Usually exempt |
| Enforcement | - | Code Enforcement |
Highlighted rows indicate differences between cities.
Palo Alto FAQ
Can I install security floodlights at home?
Yes, but aim them at your own property and use shields to prevent light spill onto neighbors. Motion-activated fixtures with limited duration are preferred.
What is a full cutoff fixture?
A fixture designed so no light is emitted above horizontal, preventing light pollution and glare. Required for most commercial installations in Palo Alto.
Sunnyvale FAQ
Can I install bright floodlights in my yard?
Only if shielded so light does not spill beyond the property line and meets Title 24 lumen limits.
Are seasonal lights regulated?
Temporary holiday lighting is generally allowed if used for a reasonable seasonal period.
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