KANDOlite 2-Pack Energy Saving LED T8 INSTAlite Plug and Play Lamps + 4 FREE Non-Shunted Socket Tombstone Jack Holders - 120-277V 17 WATT Bulbs (36W Fluorescent Bulb Replacement - 40,000 Hours) Energy savings up to 46% compared to F32T8 system Perfect retrofit for traditional lamps for INSTA START circuit with no dimension change Input voltage: 120-277V, determined by fluorescent ballast Includes 4 Non-shunted socket tombstone jack T8 lamp holders Compatible with existing ballast - 5 Year Warranty