I am looking into installing recessed lights in an existing house. Because we have insulation in the attic, I am looking at IC rated, remodel housings. Here in the US, I am finding that the 5" and 6" diameter housings are the most common, but I tend to like better the smaller 3", or maybe 4" models.
Given that context, what are downsides of smaller diameter recessed light housings (3-4"), compared to larger ones (5-6")?