Green LongLife 29001 LED Adaptor Base - Adapts 12v G4 bulb base to 1156/1141 base Adapts G4 base to BA15S T25 base (1156 or 1141 base) For use with 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