The Westek 21 in. 15W Fluorescent Plug-In Plant Grow Light has a full spectrum color bulb with an 8,000 hour life. It has a 5 foot power cord and a on/off switch to manage the grow light hours for the plants. The housing is made of plastic and measures 21 inches x 2.5 inches x 1.75 inches. The replacement bulb is part number FA315PCB.