The Future Brite Multi-Adaptor plugs into the receptacle on any Future Brite, eLux 2.0, Sunleaves Pulsar 2.0 or Luma 2.0 ballasts to make them compatible with almost any manufacturer's lamp holder. This handy device allows customers to upgrade their HID ballasts without having to replace their other existing lighting components. The Future Brite Multi-Adaptor is NOT necessary to connect the SunBrite Lamp Holder to any Future Brite, eLux 2.0, Sunleaves Pulsar 2.0 or Luma 2.0 ballast. The Future Brite Multi-Adaptor is not a splitter and will accommodate only one lamp holder at a time.