The Retro system is a great way to allow a line voltage recessed fixture to use a low voltage Solux bulb. Within the Retro system's extendable body is a 12 volt transformer that connects to a standard "screw-in" socket. The wide range of tilt and rotation offered by the Retro system makes it perfect for lighting art that is displayed on walls. Available in black or white. *Note: White fixtures may discolor from heat over time.