Alfa Lighting SP628M-BLK-AMB Rocket Quick Jack Directional Low Voltage MR16 Lamp Holder, Black with Amber Glass Height: 6-1/4-Inch, Width: 2-1/4-Inch Ceramic bi-pin socket, accepts G4 to GY6.35 bulbs Uses 50-Watt maximum bulb: JC, MR8, MR11, or MR16 (not included) Must be purchased with transformer T537QJ 12-Volt solid state electronic transformer (sold separately) for installation 90 Degree vertical aiming capability