2 county-level rules, plus city-specific rules for 2 cities in Kane County, Illinois.
Verified from official government sources
Kane County requires outdoor lighting for parking and site facilities to be designed so it does not produce direct illumination, glare, or excessive light onto surrounding property. Spillover lighting onto adjacent property may not exceed 0.5 lumens per square foot. There is no formal dark-sky ordinance for single homes.
Kane County Zoning Ordinance 25-14-1-6
Lighting installed for the purpose of illuminating off street parking facilities shall be designed so that it does not produce direct illumination, cause glare or excessive light onto surrounding public and private property. ... Spillover lighting onto adjacent property shall not exceed 0.5 lumens per square foot.
Kane County limits light trespass through its site-lighting standard (0.5 lumens per square foot spillover onto adjacent property) and a general performance standard barring operations that produce intense glare, heat, or flash creating a nuisance along lot lines. Chronic glare onto a neighbor can be addressed as a zoning nuisance.
Kane County Zoning Ordinance, performance standards (Glare-Heat-Flash)
Glare-Heat-Flash: Any operation producing intense glare, heat or flash shall be performed within a completely enclosed building in such manner as not to create a nuisance or hazard along lot lines.
2 cities in Kane County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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