The Alcyon LED Small Cylinder Track Head from Ltyespan by Lightolier is designed around the finest white LED's and thermally engineered for Superior optical performance. Delivering light equal to most MR16 lamp sources, the Alcyon is available in a range of beam spreads for lighting flexibility and is dimmable. Interchangeable optic sold separately. Features: Electronic power supply included. Dimmable with compatible Low Voltage Electronic Dimmer (see specification sheet). 365° horizontal rotation and 0-90° vertical pivot. Installation Note: Not compatible with extension wands or slope ceiling adapters. Must use Prospec Track Adapter (sold separately) for use with Prospec Track. Material(s): Die-Cast Aluminum, Glass Dimensions: 2.8" D X 1.9" W X 6.25" H Lamp Type: Led Bulbs: 1 X 16W LED Array (3000K) (included)