The ULTim8 high-efficiency ballast family operates 1 to 4 standard or energy-saving T8 lamps, and comes with a 0.78 or 0.88 ballast factor. Available in 120V and 277V models, the ballasts feature the same wiring and mounting footprint as conventional ballasts. Standard features include auto-restrike, anti-striation control, and total harmonic distortion of less than 10%.