This is the Tridonic PC 1/58 T8 Pro, a non-dimmable high frequency ballast to run 1 x 58w T8 fluorescent tube or 1 x 55w TC-L lamp. These ballasts have a nominal life time of up to 100,000 hours and provide a constant luminous flux even with fluctuations in mains voltage. Tridonic T8 Pro ballasts also have an automatic start after replacement of defective lamps and a safety shutdown of defective lamps at the end of a lamps life. All T8 pro ballasts are suitable for use in emergency fittings, in line with EN 50172 Tridonic article number: 22185215 Dimensions: L 230mm, W 30mm, H 21mm Click here to see Data Sheet and Wiring Diagrams!