GE 23674 GE332-277-N 277-volt ProLine Electronic Fluorescent T8 Standard Instant Start Ballast, 3 or 2 – F32T8 lamps. Standard Instant Start T8 Ballast will accept up to 3 or 2 – F32T8 lamps. Low profile housing and lightweight for portability. Runs quietly with most 120-volt applications, less than 10-Percent Total Harmonic Distortion (THD). less than 20-Percent with other approved lamps. High performance instant start electronic ballast is for all general fluorescent applications. Mounting dimensions: 8.9-Inch L x 1.1-Inch W, Mounting slot set 0.3-Inch apart. ProLine electronic ballasts are custom-manufactured with 100-Percent burn in on all ballasts at the factory to ensure every ballast is ready to go on-site. Parallel lamp operation keeps the unit maintenance easier to manage, if one lamp fails others will stay on. Unit is thermally protected and features an auto-restart function. T8 ballast sound rating: Class A (20-24 decibels). Ballast factor rating of Normal .87 for full light output, ballast factor rating controls light output and wattages of each lamp, a lower BF will reduce light output and wattage of each lamp, meaning more lamps would be needed to achieve a certain foot-candle level in the same area. UL Type 1 Outdoor, UL Type HL, UL Class P listed , CUL Listed, ROHS Compliant - Industry standards for safety and performance.