Light trespass onto adjoining residential property is limited to 0.1 footcandles at the property line under SLC 21A.36.290.
Exterior lighting must be aimed and shielded so that light levels at abutting residential property lines do not exceed 0.1 footcandles (measured vertically). Commercial to residential boundaries have the strictest limits. Violations trigger civil enforcement and require retrofit of offending fixtures. Complaints are handled by Civil Enforcement after inspection.
Contact your local code enforcement office for specific penalty information.
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