Ohio Rev. Code § 1567.58: Lights in mines.

The operator of each mine shall provide an enclosed lard or signal oil lamp or lantern approved by the deputy mine inspector, or incandescent electric light, at such points in the mine as are necessary, including at the top of extreme grades and in underground stations where machinery is installed. No open light shall be used for fixed or stationary purposes, and no coal oil or kerosene lamp or lanterns shall be used in a mine.

No operator of a mine shall refuse or neglect to comply with this section.