Switching Made Easy IntelliVolt versions now available, 1/2-lamp operation of 8 60/75W T12 slimline lamps;Improved efficiency over magnetic counterparts;Lighter weight with the same mounting configuration Reliable and energy-efficient, Philips Advances line of Centium high frequency electronic ballasts for 8' T12 Slimline fluorescent lamps are a great replacement option when compared to magentic ballasts. Lightweight with the same mounting configurations makes this an quick and easy retrofit solution. IntelliVolt (120-277V) input voltage range;1 or 2 Lamp operation Retail, commercial, institutional and industrial applications including; schools, offices, specialty & department stores, warehouses and manufacturing