The Sage NU221T5-ROHS is an electronic ballast for linear T5 fluorescents. The NU221T5-ROHS has the leads coming out of the side. It is a program start ballast* and operates on 120-277Vac. It measures 11.50 x 1.34 x 1.06 inches. It will operate 1 or 2 F13T5, F14T5 or F21T5 fluorescent lamps.
*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-effective choice in the long run.