The B+L NU6-1122-PSX is a very compact electronic ballast. It operates the FC8T9 22W circline fluorescent lamp. It is an instant start ballast and operates on 120Vac. The B+L NU6-1122-PSX has a plastic encasement and is UL registered. It measures 2.88 x 1.50 x 1.00 inches. It has end of life protection to protect from over heating when the lamp is at the end of it’s life