Fluorescent light bulbs have been traditionally a linear light source, but also come in u-shaped and circular. Fluorescent tubes will not work without a ballast. Fluorescent bulbs last longer than incandescent. Highlights: 9 Watt 120 Volt Color: Soft white Fluorescent light Individual On/Off or master power switch Easy installation under cabinets,book shelves Can be used in closets, counter areas, or as task lights Bulb lasts 10,000 hours and is replaceable Up to 6 can be wired together Fixture diameter is 3-3/8"