该小组表示，如果把沈阳所有学校的安全出口LED指示灯都换成这种自发电门灯，一年就可节省约70万度电。
If light-emitting diode ( LED ) lights were used with the invention at all entrances in Shenyang schools , about 700,000 kilowatt hours a year would be saved , the team said .
安全出口指示灯