Quorum Lighting 18" White Under Cabinet Counter Lamp - Light Bulb Included View Commercial: youtu.be/YanZ8oeM-aA The housings feature wiring knock-outs from all sides in which the ballasts wires can pass. Bulb Type: F15T12/SW Fluorescent. Also compatible with LED tube bulbs. Bulb is a common size available through most hardware stores. Key Features: UL Certified, Damp Rated, Energy Efficient