I'm only chiming in here to talk about aesthetics. I have a couple of 4" halogens that provide spot (task) lighting for my prep area - they are fabulous, but due to being installed in a "light bridge", they're only 4' off the counter. I also have 5" compact fluorescent cans in the kitchen and 6" incandescent cans (old) everywhere else. Aesthetically, i like the 5" best -- the 6" cans look enormous by comparison, and you need too many of the 4" cans to do the trick.

I bought something very, very similar at Costco for $25 each. I just love them - beautiful color, bright, dimmable light. One thing though, and my contractor told me it's common with most of these fixtures, is that the the spring clips bend and twist easily. I had to exchange 3 of mine, even thought the light was fine but the clip twisted and bent. Buy a few more than you need - you can always return them if you don't need them.

Rantontoo, Each manufacturer should list this information for their product. It is usually in the specifications for the lights. I am just using Contrast lighting as an example. They listed it as Specification on the particular fixture. Light spread information: See page 5 and the table named light cone describes how the light spreads at different heights based on the fixture. Something similar should be available for your lighting manufacturer. Good luck!

There are a few reasons that some in the design industry do not like the LED integral recessed cans: - the flat sealed lens is too "dead looking" when off - the baffle depth is too shallow - the throw of the light causes glare - you don't have the slight difference in lamp style, like from a PAR to BR, to fine-tune - single stamped metal trims are bulkier - if the LED goes out in the future, you have to replace the entire trim, which will probably not match the others. Nor will the sheen or transparency of the lens. - you can't experiment with different 'bulbs', you can only change the CCT - and for your specific selection the 5"/6" replacement means the trim is very wide and prominent. If you have a properly sized BR30 'bulb' that means you have 5" fixtures, not 6". As far as longevity of LED integral cans vs LED 'bulbs', it's a crapshoot for any of them. Longevity is predominantly a function of how much heat the driver electronics is exposed to. Some lamps are designed better than others for that. But if one goes out, it is overall much easier to just change a 'bulb' (or all of them) than 1/all the fixtures.