Hatch® Electronic Compact Fluorescent Ballast, Compact Fluorescent Lamp, 26 W Lamp, 4-Pin (GX24q) Lamp Base, 1 Lamp, Preheat Start, 120 VAC, 0.21 A, Ballast Factor: 1, Power Factor: 0.99, Total Harmonic Distortion: 5 to 13%, -25 deg C Minimum Starting Temperature, 3.36 in L x 2.15 in W x 1.18 in H