A Tube PL Ceiling Light features a Matte White diffuser with a White finish. Available in four sizes. One 8 watt, 120 volt PAR16 type medium base LED bulb is required, but not included. Dimmable with a standard dimmer, sold separately. ETL listed. Small: 2.36 inch width x 5.51 inch height. Medium: 2.36 inch width x 11.81 inch height. Large: 2.36 inch width x 23.62 inch height. X-Large: 2.36 inch width x 39.37 inch height.