2 rules for unincorporated Ottawa County, Michigan.
Verified from official government sources
Ottawa County and Michigan have no dark-sky preserve law for private lots. Cities and townships set lighting standards. Holland Charter Township requires outdoor light to be fully shielded and confined on-site, with fixture color temperature no more than 3,000 Kelvins.
Holland Charter Township Zoning Ordinance §§ 12.1(B)(1), 12.3(C)
Light shall be fully shielded, confined on-site by the direction of the fixture, shielding, or adjustment the level of brightness. The lighting color temperature of new and replacement light fixtures shall not exceed 3,000 Kelvins.
The county sets no rule; your city or township does. Holland Charter Township requires wall-pack and pole fixtures to be down-lighted and 100 percent cut off, and caps light spilling across non-street lot lines at 0.1 footcandle.
Holland Charter Township Zoning Ordinance § 12.1(B)(3), Table 12.3
Wall pack and pole-mounted light fixtures shall be a down-lighted type and 100 percent cut off. Light fixtures shall be constructed and installed in such a manner that all light emitted ... is projected below the horizontal plane through the lowest light-emitting part.
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