The night is about to get a bit brighter - and less expensive - in Manteca.Manteca has hired the services of the consulting firm of Siemens Industry Inc. for a sweeping change of most of the city’s street lights in a bid to reduce energy consumption. Manteca has already acquired new induction lighting fixtures to replace most city street lights via $685,830 in federal grants. The hiring of Siemens Industry to do an energy audit and inventory of the 4,800 existing street lights targeted for replacement would make it possible for Manteca to obtain rebates from PG&E of between $50 and $200 per light fixture that is changed out.The $36,000 payment to Siemens is expected to be easily recovered through initial year energy savings and rebates.