Incapsulated 9 Watt Fluorescent Quad Tube Housing and Ballast. Specifications include: Osram Bulb included, 120 Volt, UL Listed, Equivalent Par 38 approximately 50 Watt. Overall Height 6-7/8", Width 4-3/4", Non-Self Ballasted Bulb and is replaceable (SL03780). Not to be used with a dimmer.