TW Lighting T4-20 Watt 4100k 21" Fluorescent Fixture Set (2-prong Unit) Slim T4 Fluorescent Aluminum Linkable Light Fixture - White Enamel Finish Energy Savings - Output Equivalent of 100W Ribbed Acrylic Light Shield Cover Build-in 120V/60Hz Instant-on Electronic Ballast (*220 Volt/50Hz available via special order) Voltage: 120 VAC