The Tridonic PCA 1/28 TC-DD ECO xitec II is a high frequency dimmable ballast to run: 1 x 28 2D fluorescent lamp. This high performance dimmable ballast has the capacity to dim between 3-100% on either Dali or DSI dimming. It has a nominal life of 50,000 hours and a constant luminous flux irrespective of fluctuations in mains voltage. Tridonic part number 22185255. Dimensions:&nbsp;123mm (L) x 102mm (W) x 30mm (D)