5.23_01_SignalBulb_BAY15d_S25By LumiactionTomYeh / July 11, 2023 Signal bulb, BAY15d S-25m/m, bayonet base, voltage 6V/ 12V/ 24V. replace GE 1016, GE 1077, GE 1078, GE 1154, GE 1157, GE 1157A. ECE P21/5W.