235.175.  Increase of tax rate — election — form of ballot — maximum rate. — 1.  Before the board of directors of any street light maintenance district may increase the district's current tax levy, the proposed increase must be approved by a majority of the voters voting thereon.

  2.  The proposition to increase the tax levy may be submitted by the board of directors or upon petition of five hundred registered voters of the district.  All propositions to increase the tax levy shall be submitted at the next election permitted by section 115.123.

  3.  A separate ballot containing the question shall read as follows:

  4.  If a majority of the qualified voters casting votes thereon be in favor of the increased tax levy, the board of directors shall raise the tax levy to the level approved by the voters.  If a majority of the voters casting votes thereon do not vote in favor of the increased tax levy, any levy previously authorized shall remain in effect.

  5.  No street light maintenance district shall fix a rate of levy which exceeds the maximum tax levy authorized by section 235.170.