LiLEDs LED Downlight retrofits are designed to replace traditional CFL and incandescent downlights. The robust design and a driver that is compatible with many traditional triac dimmers make this retrofit a practical solution for a wide rage of applications. There are two models: one for 4 inch and the other is for 5 and 6 inch fixtures. The spring plates and spring wires make the retrofits work with all downlight fixtures.