SYLVANIA ULTRA RT6 and RT6 Gimbal LED Recessed Downlight Kit. A high-performance, easy to install residential and commercial grade downlight solution offers good light output, energy-efficiency and a streamlined design. It fits into most 6 in. IC (insulated cans), non- IC and air tight incandescent cans. The kit includes a six-inch LED recessed downlight with white trim and a medium base socket adapter.