GE UltraMax N+ electronic ballasts are a normal-high light option. The 1.0 ballast factor is a perfect balance between efficiency and high light output. The N+ line is designed for high efficiency high bay fixtures that use high reflectance materials. The GE 71421 electronic fluorescent ballast operates (2) F32T8 lamps at 120/277 input volts. Ideal for use in normal light areas, this instant start ballast is typically used in offices, board rooms, and retail.