I only know of one IC retrofit light, the Halo H99ICAT. It's fluorescent though. Comes in 13w and 18w versions. Not dimmable.
Re the Contrast lights, they are my absolute favourite by a huge margin. Nothing else I've worked on is as quick and easy to throw into a ceiling, with minimal frustration. They also come out easily if you need access to the JB or the ceiling cavity later on. You have to use a connector, yes, but in my opinion that's still better(and faster) than NM clips because you never have to fight the clamp and squeeze it with your needle nose to get it to hold your wires in. Once you have done a few of them you get a rhythm and the lights go up real fast. It is a bit annoying that there aren't push-in connectors already there but at least you get a nice solid connection forever.
What I generally do with a contrast housing is pop the knockout and stick the connector in, then strip NM and make splices before inserting through the connector. Wrap the fixture wires onto splices and twist marrette...finished. After using these, anything with spring clips looks like it dates back to somewhere around the bronze age. The transformers on their low voltage lights are very high quality too. Have not seen many burned out.
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