Programmed Start Lamps in Parallel Side exit leads Mounting feet Up to 21’ remote mounting For multiple Biax (TT5) long twin tube fluorescents and linear T5 120-277Vac UL, cUL 9.50 x 1.72 x 1.16 The Sage SXU255T5-ROHS is an electronic ballast for Biax (TT5) long twin tube compact fluorescents and T5 linear fluorescent. The SXU255T5-ROHS has the leads coming out of the side. It is a programmed start ballast* and operates on 120-277Vac. It measures 9.50 x 1.72 x 1.16 inches. It will operate 1 or 2 50W, or 55WBiax (TT5) long twin tube fluorescent lamps or 1 F54T5 or 2 F39T5 linear fluorescents. *A programmed start ballast for fluorescent and UV-C lamps extends lamp life by gently preheating the electrodes before ignition. This "programmed" preheat prevents electrode damage, making it ideal for applications with frequent on/off cycling, like offices with occupancy sensors. While it causes a slight delay in illumination and costs a bit more, its ability to significantly prolong lamp life makes it a cost