Hall County school officials are moving ahead with a study to determine the economic feasibility of replacing the lighting at all of the district’s gymnasiums with energy-efficient alternatives. The school board went along with a recommendation by the Facilities and Construction Department in approving a bid of almost $85,000 by Georgia Power to undertake the study. Before voting at their Monday night meeting, board members asked Facilities Director Matt Cox to explain the criteria used in choosing Georgia Power over Siemens, which submitted a low bid of $73,500.