Liteline"s track fixtures are constructed of die-cast aluminum, which provides superior strength and rigidity. The design is modern, with the softened edges adding to the contemporary aesthetic. With a myriad of styles and finishes to choose from, you"ll definitely find a fixture for every application. The APOLLO track fixture provides a directional light source for specific aiming and assures a secure lock on the angle position. The porcelain socket is designed for 120V MR16 GU10 bulbs (50W max). The bulb housing is controlled with an adjustable yoke that provides custom aiming of 320 degrees horizontal rotation and 160 degrees vertical rotation. This track fixture is dimmable when used with electronic low voltage rated dimming controls only.