The last major U.S. factory making ordinary incandescent light bulbs will soon be closing. When it does, the remaining 200 workers at the Winchester, Va., plant, about 70 miles west of Washington, D.C., will lose their jobs, marking a small, sad exit for a product that began with Thomas Alva Edison's innovations in the 1870s. The last major GE factory making ordinary incandescent light bulbs in...