It is supposed to be adaptable to an existing 5" or 6" diameter recessed can. It is not. The 5" diameter setting does not fit a 5" diameter can from the late 80's.

The light itself is very nice. I purchased two. I like that you can select the wattage and warmth of the light. However, the diameter of the fixture is too narrow. I can't quite cover the opening in the ceiling with it. More frustrating is the fact that the little springs designed to hold it in place... don't. It sags and leaves a gap between the light and ceiling. The original lights were installed in 2004 when the house was new. The lenses deteriorated to the point that I needed to replace them, but the springs on the old lights worked very well - different design. The bottom line is that these are unusable. I'm out $51.34. I mangled one of them trying to make it work, so I don't believe I can return them.