I appreciate that, Patricia. My issue is that the 4" don't give enough lumens compared to the 6" (I'm using the wafer-thin ones), so I would have to put more of the 4" lights than the 6". Just trying to decide which would look better/worse. (I like the smart control lights for in front of the TV, for instance.)

Honestly, I don't think one light every 10 feet is enough with either size. If you want to post a general floorplan, I'm happy to say where I'd put lights. Can't imagine working in a kitchen with a single can either -- I have 4x 4" cans in my kitchen which is like 9x11 feet, and we have under-cabinet lights to supplement that for task lighting. Maybe a single large fixture and a ring of small cans, but...

• How Many Recessed Lights?
• Recessed Lighting Calculator

In my 17' x 14' living room I used six fixtures with Euri Lighting PAR20 50 watt bulbs. I used traditional 4" housings with Juno trim so the surface of the bulbs (500 lumen; 2700K or 3000K, I can't remember) would be recessed into the ceiling and be less visible from below. I control the lights with Lutron LED+ dimmers.

I would NOT use 6" fixtures.

UPDATE: I did end up doing the 6" lights (flush to the ceiling so they are less noticeable) and I LOVE them! I have 3 rows of 3 with a directional gimbal over the piano and over the fireplace (accent light). I LOVE that I can change the temperature of the lights on the fly ("Okay, Google. Change all lights to soft white." Or "Okay, Google. Change lights to 6000K."), depending on the activity (doing a puzzle vs watching TV, for instance). Thank you to everyone who offered feedback and ideas! (I hope that one day they will make the 4" lights with more lumens, but I had to work with what is available.)

What lights did you choose? Did you also put them on a dimmer switch? I am looking for smart recessed lights that can also work off of a dimmer switch if someone watches our house.

@Michelle Fisher: "I am looking for smart recessed lights that can also work off of a dimmer switch if someone watches our house."

You might look into the Lutron Caseta system that will allow you to control dumb LED lights and fixtures with Caseta wall switches and Caseta wall dimmers. Add a wifi "smart bridge", and you can control those switches and dimmers with an app for an Android or iPhone. Be sure to check whether the electrical box containing the switch or dimmer you'll replace with a Caseta device has (or does not have) a neutral wire. Also, Caseta devices are sold individually or in bundles. Bundles are much cheaper per device so decide what you need before buying.

Thanks! Are there any lights that change color/temperature compatible with this dimmer?

"Are there any lights that change color/temperature compatible with this dimmer?"

https://www.lutron.com/en-US/Pages/LEDCompatibilityTool/Compatibility.aspx

Halo also has its Halo Home system.

https://www.homedepot.com/collection/Lighting/HALO-Home-Collection/Family-305059613

Examples:

• Halo4 in. Tunable CCT (2700K-5000K) Bluetooth Smart Integrated LED Recessed Trim with In-Wall Accessory Dimmer by HALO Home
• Halo4 in. Tunable CCT (2700K-5000K) Bluetooth Smart Integrated LED Recessed Trim with In-Wall Accessory Dimmer by HALO Home

@Michelle Fisher I ultimately used Lumary 6" wafer thin lights and they are AWESOME! They are so thin that they fit in the same space as drywall, so they can fit under your trusses, if necessary, with no can. Since I got the 6" (1100 lumens), they are very bright! (I don't think the 4" would have give me enough light at 810 lumens).

These lights do NOT need a dimmer (as a matter of fact, dimmers are not recommended) because everything (light temperature/Kelvins, dimming, color, timers, sync to music, etc.) is controlled with the app OR I can control them with my Google Home (or Alexa, if you have that). I can set "scenes" like "TV watching" or "romantic" or "games" or control each light individually. For instance, I can say, "Hey Google, turn on the living room lights" and it will reply, "Turning on 6 lights." "Hey Google, turn the living room lights to 3000 Kelvin." "Hey Google, make the lights blue (or orange or whatever)." "Okay Google, turn on the entry light" and it replies, "Turning on one light in the entry."

I did upgrade my home wifi to support all these lights (9 total lights) because each counts as a device (computer, cell phone, TV, light 1, light 2, etc.). They are still connected to a rocker switch (or flip switch) so you can turn them on/off manually, too. It remembers your last setting if the electricity or wifi go out (if you lose wifi, when it's restored, your lights don't have to be reprogrammed).

These lights use integrated LEDs, are connected with a junction box, and are IC rated (to be in contact with insulation). My electrician installed them in about 6 hours, running electrical, connecting the junction boxes, and everything. If a light goes out, you just unplug the light from the junction box and plug another one in (but they are good for about 20,000 hours, so it will hopefully be a while before I need to replace any). They run anywhere from $25 - $30 each, depending on where you buy them, how many, and if there are any coupons/deals available.

https://www.amazon.com/LED-Recessed-Lights-Ultra-Thin-Inch/dp/B088YT4K42/ref=sr_1_10?crid=21Y4RBQ400MVC&keywords=lumary%2B6%2Binch%2Bsmart%2Bwifi%2Brecessed%2Blights&qid=1646626710&sprefix=lumary%2B%2Caps%2C118&sr=8-10&th=1

I do wish I could have gone with the 4", but I'm ultimately happy with my choice!