Type A LED T8 tubes - lot of 3600Compatible with most electronic ballasts in use in your office now. IF you have Flourescent T8 tubes these will swap into the exiting fixtures and provide better light at 50% less energy. LED THK TUBE 110 4K4E 22 watt ( use 3 to replace 4): 120 347 volt, 4000 K color, 5 year warranty. First and only patented True T5 HO LED replacement tubes Member of our patented Easy Swap technology family No Internal External Drivers Will work perfectly with your