Ballast Electronic for use with T5 Lamps, Number of Lamps 1 or 2. Voltage 120-277, Programmed Start, Amps AC 0.55-0.23 Input Watts 64-63 Ballast Factor 1.00 Power Factor More Than 0.97 Total Harmonic Distortion Less Than 10 Normal Light Output Series. Dimension Reference G14. Number of F21T5 Lamps 1 or 2.