DIN CLC/TS 50509
DIN CLC/TS 50509 Use of LED signal heads in road traffic signal systems; German version CLC/TS 50509:2007
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2008