Mich. Comp. Laws § 324.75104: Outdoor lighting; requirements.

Sec. 75104.

(1) The commission shall ensure that all outdoor lighting within a state-owned dark sky preserve conforms to the following:

(a) Lighting shall be directed downward.

(b) If possible, lighting shall be provided by fully shielded fixtures.

(c) If practical and appropriate, outdoor lighting fixtures shall be motion sensor fixtures, and not fixtures that remain lighted during all hours of darkness.

(2) Notwithstanding any other provision of this part, the use and development of land within a state-owned dark sky preserve, including the use of the land for motorized and nonmotorized recreation, shall not be restricted due to the designation as a dark sky preserve.