Green LongLife 29002 LED Adaptor Base - Adapts 12v G4 base to 1157 base Adapts G4 base to 1157 BAY15D T25 base For use with all 12v and 24v G4 Green LongLife LED bulbs Does not contain mercury or emit ultraviolet (UV) light No moving parts or filaments and can withstand shaking and vibration