Phillips Instantfit T8 LED Tube. 4-pack!! No Rewiring Phillips LED InstantFit lamps are an ideal energy saving choice for existing linear flourescent fixtures. Benefits: Over 50% energy savings vs F32T8 electronic instant start systems. No mercury, no UV rays, Glass free, 4 year limited warranty. Features: Instant on no flicker or buzz. Fits into existing linear fixture. Compatible with existing fixture linear ballast. No rewiring of fixture necessary (phillips lighting ballast compatability guide or email seller) while still maintaining UL fixture compliance. Works in spaces with temperaures to -22F Warning: Must use InstantFit T8 tubes in fixture only. Can not be used with other LED or flouresent tubes.