Nora Lighting NL-402S Shallow Low Voltage New Construction Width: 6" Length: 8.5" Height: 3.5" Ceiling OpeningDiameter: 4.375?" Uses one 50 watt MR16 GU5.3 12 volt halogen light bulb Power supply required: 12 volts Rated for interior damp installation Safety certification: UL (Underwriter's Laboratory) listed