The Tridonic PCA 1x26-57 TC ECO xitec II is a high frequency dimmable ballast for use with DALI/DSI/switchDIM interfaces. Compatible with the following lamps: 1 x 40w T5 Circular Lamp 1 x 26w Double Turn Compact Fluorescent Lamp 1 x 26w Triple Turn Compact Fluorescent Lamp 1 x 40w Long Single Turn Compact Fluorescent Lamp 1 x 40w T5 Circular Fluorescent Lamp 1 x 32w Triple Compact Fluorescent Lamp 1 x 42w Triple Turn Compact Fluorescent Lamp 1 x 57w Triple Turn Compact Fluorescent Lamp Tridonic part number: 22185120