Sometimes we need to use two 4" cans or 5" cans over the sink to get the correct spacing around the ceiling joists. Then we use the 6" in the rest of the ceiling. It is more important to be aware of the height of the bulb. In the Lightolier cans, the non-IC sit higher up in the can than the IC fixtures. So the spread of light is less with the non-IC. We also try to put the cans 22" off the wall so they will be out of the way of the cabinet crown moulding and be over the work space of the countertops. Sometimes we need to go with the 5" cans to accomplish this.
