Philips Advance IOP-2S2895-SC-SD-35M Electronic Step-Dim Ballast 2-Lamp 120/277V

Electronic Step-Dim Ballast, Fluorescent, Input Voltage: 120/277V, Programmed Start, Optanium Series. For use with the following Linear Lamp Types: (2) F14T5, (2) F21T5, (2) F28T5 or (2) F35T5.