PAR38 Gimbal Ring line voltage track lighting head. E26 socket (Medium / Screw-in base) base. 90W Max. Halogen bulb. ( BULB NOT INCLUDED) H type compatible with H type 3-wire-1 circuit track system 350° horizontal rotation or 90° vertical project. UL Listed. Rated for Indoor use or Dry locations. Please be advised the size of PAR38 LED light bulbs are not standard. Bulbs with 4.78" diameter and 5.12" length would fit perfectly in the fixture trim. Direct-Lighting PAR38 Gimbal Ring line voltage track lighting accepts PAR38 size lamp **Light bulb not included**. The gimbal ring, rear loading line voltage track lighting fixture combines contemporary style and full functions. This simple and clean designed track head is an ideal accent lighting choice for retail store lighting, gallery lighting, display lighting, task lighting, product highlighting, and residential lighting purposes. E26 socket (Medium / Screw-in base). Compatible Lamp : PAR38 Halogen. Track System : Compatible with any typical H system 3-wire-1 circuit track system. Wattage : 90 Watt Max. Voltage : 120V. Finish : White. Rating : UL Listed. Video #1 - Installation : https://youtu.be/zDFSD6W3Ki4. Video#2 - How to install light bulb into the rear loading Track Light Bulb :https://youtu.be/Owjka3j6QFk