The city is asking residents to vote by mail by July 15 on a plan that would change the way the city splits the cost of street lighting. The city expects street lighting to cost about $1.15 million next year. Single-family homes on lighted streets would pay the most, $25.70 a year. Under the proposal, the assessments would no longer be tied to the value of a home but rather to the benefits that residents receive from street lights. If voters reject the plan, the current lighting assessment districts will expire in 2010. If that happens, the city will be responsible for paying the entire costs of street lighting.