This application note describes a demonstration board able to drive 2 x 58 W linear T8 fluorescent tubes. The last section of the document describes the changes that need to be made to adapt the same board for 2 x 36 W linear T8 fluorescent tubes. The ballast is controlled by the new L6585DE IC that integrates the PFC and half-bridge control circuits, relevant drivers, and the circuitry that manages all the operating phases (preheating, ignition and run mode) of the lamp. Protections against failures such as lamp disconnection, anti-capacitive mode and PFC overvoltage are guaranteed and obtained with a minimum number of external components.