2 county-level rules, plus city-specific rules for 1 city in Polk County, Iowa.
Verified from official government sources
Article 12 requires non-residential exterior lighting to use cutoff fixtures. Lighting must be a no-cutoff, total-cutoff up to 90 degrees, or total-cutoff at less than 90 degrees type, and non-residential projects must submit a lighting plan.
Polk County Zoning Ordinance, Art. 12, Div. 1, Sec. 4 (Exterior lighting options)
Exterior lighting shall be a No cutoff, Total cutoff up to ninety (90) degrees, or total cutoff of light at an angle less than ninety (90) degrees. The lighting shall meet the standards set for each type of fixture.
Exterior lighting must restrict glare and keep light from encroaching onto adjacent properties and the road right-of-way. Flickering or flashing lights are banned, and lighting near residential property faces added buffer restrictions.
Polk County Zoning Ordinance, Art. 12, Div. 1 (Purpose) and Sec. 2 (Restrictions)
Exterior lighting shall restrict and divert glare and keep light from encroaching into the road right-of-way and beyond property lines... No flickering or flashing lights shall be permitted.
1 cities in Polk County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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