2-lamp 32wt8 high efficiency instant start electronic ballast, universal voltage, normal ballast factor features: high efficiency systems over 90%efficient nema premium ballast (npb)program compliant over 100 lpw (lumens/watt) with octron supersaver lamps lowest power t8 i.s. Systems universal voltage (120-277v) small can enclosure size 30-50% energy savings min. Starting temp: -20f(-29c) for t8 lamps 60f (16c) for energy saving t8 lamps 0f (-18c) for fo40t8 lamps <10% thd virtually eliminates lamp flicker