Gimbal Ring Track Head. For use with LED or incandescent PAR20 lamps, 50W max., medium base (E26) socket. Fits 120 volt 1-circuit or 2-circuit track systems. MODELS: 2779 (lamp not included); 2783 (includes 8W/520 lumen/3000K/30° LED PAR20 lamp). Body in Black (-5), White (-6), or Silver Gray (-20). 3 1/2″ D x 6 3/4″ L