I have a sloped ceiling that has plywood screwed down on the attic-side so I had to put regular, low-profile 6" cans in the slope but the lights would shine in your eyes, which was not desirable. I had to install these over my original ones because my original ones held the bulb - and it worked just right after I took tin snips and partially cut my original ones so the spring retainers would go right through and would hold both recessed covers in place. They came out marvelous looking. I also got the BR25 LED bulbs on Amazon and they are as large a bulb as you can get in these fixtures (2.5").