I have 13 recessed lights at home. After starting the installation, I found that I have at least three different types of glass on the ceiling. The first few jars didn't have the required "C-clamp" to use these bulbs, but I was able to pick up a few cheaply here on Amazon (search for "C-clamps"). Installing the lights, which required additional clamps, took about 30 minutes; However, the clip jars already took less than 5 minutes including installing a ladder to get to them. The headlights seem to seal well and use some of the energy from the old bulbs. I used an IR temperature meter to make sure they were operating below 100 degrees when turned on. I added a "D" shaped rubber grommet around the rim that touches the ceiling of the jars that are in my 2nd floor attic to add a little extra thermal barrier. Overall I'm very impressed and they definitely add a more modern, clean look. look inside.
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