GE Lighting 68186 GEM120PH120DIY LFL Magnetic Rapid Start Ballast for 1- F20T12, F15T8, F1512 - 120V Magnetic Ballast (200H2) Mount length: (M) 2.8-Inch / Mount slots: (MS) 0.2-Inch GE's ballasts are among the highest energy-efficient ballasts available For 1- F20T12, F15T8, F1512 Starting method: Preheat Ballast type: Magnetic