2 county-level rules, plus city-specific rules for 1 city in Washtenaw County, Michigan.
Verified from official government sources
Ann Arbor adopted a dark-sky lighting ordinance (UDC Section 5.25) in 2021. New luminaires must be fully or partially shielded, use warm-white light (CCT 3000K or lower, CRI 70+), and decorative facade and landscape lighting must be off from midnight to 6 a.m.
Ann Arbor UDC 5.25 Outdoor Lighting
Outdoor lighting must use colors no bluer than "warm white" (Correlated Color Temperature no greater than 3000 K); and must approximate a natural light source (Color Rendering Index of at least 70).
Under Ann Arbor's Unified Development Code (Section 5.25.2), exterior lighting must be shielded so no light glares onto a public right-of-way or residential property, and the light cast onto residential property may not exceed 0.10 footcandle.
Ann Arbor UDC 5.25.2
All exterior lighting devices shall be adequately shielded and screened so that no light will glare directly onto any Public Right-of-Way or property principally used for residential purposes... the amount of light projected onto property principally used for residential purposes does not exceed 0.10 of a foot candle.
1 cities in Washtenaw County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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