Ohio Rev. Code § 515.07: Notice to bidders - acceptance and rejection.

If the total estimated cost of any lighting improvement provided for in section 515.06 of the Revised Code is fifty thousand dollars or less, the contract may be let without competitive bidding. When competitive bidding is required, the board of township trustees shall post, in three of the most conspicuous public places in the district, a notice specifying the number, candle power, and location of lights and the kind of supports for the lights as provided by section 515.06 of the Revised Code, as well as the time, which shall not be less than thirty days from the posting of the notices, and the place the board will receive bids to furnish the lights. The board shall accept the lowest and best bid, if the successful bidder meets the requirements of section 153.54 of the Revised Code. The board may reject all bids.