The Cree UR Series LED Upgrade Kit features a 102-lumen-per-watt linear LED lamp to replace T8 and T12 linear fluorescent fixtures. The kit covers 2- and 4-foot lengths in various lamp configurations. Its magnet design, quick-connect technology and form-fitted driver provide easy installation. The UR Series LED lightbars and driver fit into almost any linear fluorescent luminaire without the need to reuse existing sockets and ballasts.