You do need to replace the unit that fits into the 6" can, but not the 6" can itself.
You should be able to pull the trim cover down from the can, and squeeze the torsion springs together, without damaging the ceiling. Click on the link to view the installation guide for more details: http://www.e-conolight.com/pdf/Instructions/CI382X01R0.pdf.
These lights are non-dimmable.
Date published: 2016-06-20