Direct-Lighting 50010 Black MR16 Cylinder Low Voltage Track Lighting Head 50W MR16 steel stamping track head with polycarbonate transformer case MR16 GU5.3 ceramic socket 50W Max. Halogen or LED ( 7W or above) bulb if using LED bulb do not use front glass, Max LED bulb length from bulb face to end of bi-pin is 2" H System configuration, can be compatible with H type 3-wire-1 circuit track system Integral electronic transformer and MR16 lens holders are included. UL Listed. Installation Video: http://youtu.be/QpwIEEQFJwg