2 rules for unincorporated Lake County, Illinois.
Verified from official government sources
Lake Forest, Highland Park, Libertyville, and unincorporated Lake County require fully shielded (full-cutoff) outdoor fixtures under local zoning. Most adopt IES standards; Lake Forest caps fixture height at 15 ft in residential zones to protect lake views.
Light trespass onto neighboring properties is prohibited under Lake County UDO §12.7 and municipal nuisance codes in Highland Park, Lake Forest, and Libertyville. Most cap spillover at 0.1 to 0.5 footcandles at residential property lines.
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