I've been using this configuration successfully for a while, but recently I noticed that I was having trouble with the lights on a wall dimmer farthest from Smart Bridge, I thought that maybe the wall dimmer itself is not working properly and had to be replaced, but after a bit of troubleshooting I was told that I had range problems because my lamp dimmer no longer extended the range. I don't know exactly how it happened, but I noticed that when I went to the settings in the Lutron app and looked at range settings, I was told that I should add a range to increase the range. In other words, the lamp dimmer worked fine to control my lamp, but it did not extend the range.
To fix this problem, I deleted the lamp dimmer from my HomeKit configuration with the Lutron app, put it back on, and then the Lutron app automatically made it dimmer to a range. And then the lights began that I had trouble working perfectly again.
Unfortunately, if you have multiple Lutron lamp dimmers, there is currently no way to designate one of them as a range extension. The first thing you add to your HomeKit system is the range extension, and any subsequent ones are just normal dimmers. So if you are planning to use multiple lamp dimmers in your home, make sure the first one you configure is in the most strategic place to expand your wireless range, and then place the other lamp dimmer (s) where you just want to use as a dimmer. To designate another lamp dimmer as a range extension, you should first remove all lamp attenuators from your HomeKit account, then add the one you want to extend the range, and then add the other lamp attenuators.  All of this sounds very clear when I write this post, but it took me a long time to figure out what happened when I was having trouble with my lights. It took a long time to realize that there could be a problem with the reach extension. If you decide to install Lutron Caséta devices in your home – and I highly recommend them – make sure you utilize a lamp dimmer to extend the range. And if you ever have problems with lights that are far from the Smart Bridge, you can learn from my experience and look at the settings in the Lutron app and confirm that your lamp dimmer works as a range.
If you are I would like to start using a Lutron Caséta system, there are many ways to buy it on Amazon, and I've included a few links below, but you can set it up many different ways. Surely, you will have a wall dimmer and a smart bridge. You can also get a remote (which Lutron calls the Pico remote) that is included in some kits, and you can use that remote either on your own, or you can mount it on a wall with a wall bracket. For example, if you want to control the lights in a room from two different light switches, you can put a dimmer on one wall to actually control the lights, and then you can mount Pico on another wall with a wall bracket, and it will look almost exactly like a dimmer switch, but it will actually send a signal from Pico to the dimmer on the other wall to control the lights. And you can buy Lutron Caséta in several colors to match your décor. In most of the rooms in my house I use Light Almond, but in my TV room I use white, and you can also buy black or ivory.
Click here to get a Lutron two-wall dimmer and Smart Bridge starter kit on Amazon ($ 159.80)
Click here to get a Lutron wall dimmer, pico remote and Smart Bridge starter kit on Amazon ($ 99.95)
Click here to get a Lutron wall dimmer on Amazon ($ 54.93)
Click here to get a Lutron lamp dimmer on Amazon ($ 47.95)