Direct-Lighting 50047 White Universal Line Voltage Track Lighting Head Universal PAR bulb line voltage track lighting head. E26 socket (Medium / Screw-in base) base. 150W Max. Halogen or LED bulb. H System compatible with H type 3-wire-1 circuit track system ( with measure 15/16-inch, measure from tip to tip) 350 horizontal rotation or 90 vertical project. UL Listed. Rated for Indoor use or Dry locations. Installation Video: http://youtu.be/QpwIEEQFJwg