Jesco Lighting SG4A-8SW/64-S Sleek Plus Adjustable Grounded 8-Watt T4 Light Fixture, 6400K Color, Silver Finish, With Switch Fluorescent fixtures are linkable up to 10 units and feature an adjustable light shield that provides 360 rotation to direct light where necessary Housing made of extruded aluminum, anodized silver or white enamel painted finish Fixture features a built-in instant-start, no flickering, silent electronic ballast rated AC120V 50-60Hz Ribbed acrylic diffuser lamp cover fits securely on the housing of the fixture with no light leaks, warping or deformed lens T4 lamps (included with fixtures) are energy efficient, long life with a 16,000 hours rating