My electrician is started rough in this week on my custom build. He's telling me that although the plans call out 6" cans in our great room cathedral ceiling, we're going to have to use 4" instead, because the 6" cans are too deep. The framing is 2x6, with California fill over about half of the room, so there's no attic space above. Can anyone recommend a large size can with a 5 1/2" or less housing depth? I realize this product might not exist, but I really don't like the idea of using two smaller can per space!