Keystone’s ComboDrive X3 LED tube with Color Select technology is a UL Type A&B tube with selectable CCT and the ability to use as either a UL Type A LED tube with an instant start ballast or a UL Type B LED tube in a ballast bypass application. It features five selectable color temperatures – 3000K, 3500K, 4000K, 5000K, and 6500K – which can be changed from one to another with the flick of a switch. Installation is either plug-and-play by switching out the old fluorescent tube, without any changes to the fluorescent ballast wiring, or ballast-bypass by connecting the tube directly to 120-277V line voltage. ComboDrive X3 T8 tubes are approximately 60% more energy-efficient than standard F32T8 lamps, feature a 50,000+ hour lifetime, and are dimmable with compatible dimming ballasts. With all these features, the tube can be left in a maintenance closet or pulled off a truck and adjusted in the field to solve a variety of issues