Dark Sky Rules: Isleton vs Vineyard
How do dark sky rules rules compare between Isleton, CA and Vineyard, CA?
Isleton and Vineyard have similar restriction levels.
Isleton, CA
Sacramento County
Unincorporated Sacramento County has no comprehensive dark-sky ordinance for single-family homes. However, the Zoning Code requires full cut-off, shielded, downward-directed lighting for multifamily, commercial, and parking-area fixtures (Sec. 5.4.3, 5.9.4.G) to reduce light pollution and glare, referencing IESNA standards.
View full Isleton rules →Vineyard, CA
Sacramento County
Sacramento County Zoning §5.12 (Outdoor Lighting) requires shielded full-cutoff fixtures for parking lot, security, and commercial lighting in Vineyard. Residential is less regulated but light trespass standards apply at 0.5 fc.
View full Vineyard rules →Key Facts Comparison
| Fact | Isleton | Vineyard |
|---|---|---|
| Comprehensive dark-sky ordinance | None for single-family homes | - |
| Multifamily/commercial fixtures | Full cut-off, fully shielded, downward-directed | - |
| Standard referenced | IESNA full cut-off definition | - |
| Parking-area lighting | No fixture may illuminate off-site (Sec. 5.9.4.G) | - |
| Timing controls | Timer/photocell, dusk-to-dawn operation (multifamily) | - |
| Code section | Zoning Code Sec. 5.4.3, 5.9.4.G | - |
| Commercial Fixture | - | Full cutoff required |
| Pole Height Cap | - | 25 ft (commercial) |
| Light Trespass | - | 0.5 fc max property line |
Highlighted rows indicate differences between cities.
Isleton FAQ
Does unincorporated Sacramento County have a dark-sky ordinance?
Not a comprehensive one for single-family homes. The Zoning Code requires full cut-off, shielded, downward-aimed lighting for multifamily, commercial, and parking-area uses (Sections 5.4.3 and 5.9.4.G) to limit light pollution, referencing IESNA standards.
What lighting standard applies to a new apartment or commercial parking lot?
New fixtures must be full cut-off as defined by IESNA, fully shielded or recessed, and directed downward and away so that no fixture illuminates an area outside the site, per Sections 5.4.3 and 5.9.4.G.
Vineyard FAQ
Do my Vineyard porch lights need to be shielded?
Residential porch lights aren't subject to full-cutoff rules, but if they cause direct trespass over 0.5 fc onto a neighbor, SCC §5.12 applies.
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