Yes, I mentioned UCL. I can add those questions here too, if you want them. ;) GC mentioned tape. Another contractor I've had doing some other stuff mentioned pucks. I've become enamored with the Environmental Lights ultra thin system. I have emailed them questions. It's been a couple days, I'll probably call them today. Today, the electrician is prepping for outlets for the UCL in three spots where these wall cabinets will be: --next to fridge --each of the cabinets flanking the range I haven't zero'd in on a system yet, but that seems okay. I am unsure if I'll want lights over the washer and dryer. In the past, that's been a clutter catching area. Of course I'm hoping that it won't be now with better storage, but...we'll see. I think, at least with the EL system I think I understand pretty well. I can run all the lighting on that wall with one power supply and have the wire connectors connecting the different strips, and I don't really need the second outlet on that wall. But if I go with something different, I might need it just for that second wall cabinet by the range OR I might need it for the W/D area. (The wall behind the W/D is masonry, no way I'm having an outlet added there.) A question I've got re: the EL system is if I can have those three outlets on one switch, and have two or three power supplies plugged into them as needed. I think that is fine. The bigger question that I don't think I like the answer to is about dimming. And I think my mindset at this point is to not worry about dimming for the UCL. They make this stuff to be UCL, I'm going to assume it's a good brightness for it's intended purpose. I've never had UCL, so I have no frame of reference. Once I figured out the pieces that I think I need from EL, the price was a bit more than I was thinking of. However, there's the benefit that I understand it. :) I think. I'm open to other, less expensive, good systems. But I need to understand them. As always, thoughts/suggestions welcomed.

I have 4" in my bedroom and master bath. They look much more streamlined than a 6". You can always plan an extra light or two if he is concerned about the overlap - go to a lighting store and look at the latest LED fixtures in 4" size. We will be doing the kitchen early next year and I plan to put in 4" because I like the look of them so much.

We recently went with 5" lights in a very similar kitchen and lighting arrangement to the one you're describing. 4" seemed too small and 6" too big. The 5" use the same housing as the 6", which had us stymied for a bit until we figured it out. The critical number you're looking for is the lumens. A correct lumen choice will give you all the coverage you need. We used to use 100 or 75, etc. watt bulbs and we knew how bright that was. With LED lights, there are lumens, a different set of numbers with the same result. You're probably looking for something around 960 lumens each for your setup. We got our lights from Costco and they were about 1100 (?) lumens. When everything is turned on and up you could land an airplane in our kitchen. The other number is a color "warmth" number. 2700 is popular in kitchens, but some people go whiter/cooler with 3000 or even higher.

4 or 5" would be fine for countertop lighting w/8' ceiling. here's a guide To determine how far apart to space your recessed lights, divide the height of the ceiling by two. If a room has an 8 foot ceiling, you should space your recessed lights approximately 4 feet apart. If the ceiling is 10 feet, you'll want to put about 5 feet of space in between each fixture [https://www.houzz.com/discussions/4-or-5-or-6-led-or-cfl-recessed-lights-dsvw-vd~210656[(https://www.houzz.com/discussions/4-or-5-or-6-led-or-cfl-recessed-lights-dsvw-vd~210656)