QUANTITY OF 6 .The Robertson 3P20132 Fluorescent Electronic Ballast is designed to power 1 or 2 T8 lamps with a power source of 120Vac. It is compact in size and made of aluminum, offering a durable and lightweight option for facility lighting. The ballast features a stamped finish and a ceiling mount mounting type, making it a practical choice for maintenance and safety in business and industrial settings. With a light source wattage of 40 watts and a voltage of 120 volts, this electronic ballast ensures energy efficiency and reliable performance for your lighting needs.