I decided to add a second bulb and do some additional testing. The bulb appears to dim below 10%. I used a simple LUX app on my phone and could see changes down to 5%. I can set dim to 1% but I'm not sure it actually dims below 5%. So far the two bulbs are working far better than I would have expected.
Do you know if they Are Zigbee repeaters?
From the http://hub_ip/hub/zigbee/getChildAndRouteInfo page, I don't see these at all. I don't know if that means they aren't repeaters or not. Perhaps @mike.maxwell could comment. At this point, I wouldn't want to say "these are great" but unless they do disturb my small Zigbee mesh (20 or so devices), I will hang on to them.
I thought I would update this post.
I finally paired all the downlights. They have not been an issue so far. None of them have dropped off the network or caused me any mesh difficulty. They respond well with dimming and color temperature changes.
In the getChildAndRouteInfo page, these devices show up as Ember_End_Devices which means they aren't repeaters. That they are not repeaters really allays some early fears I had after ordering these.
I think these are Home Depot brand. I bought 6 as one of the first devices I bought when I got Smartthings a few years ago. As far as I can tell they are not repeaters. I have mine on a switch so they loose powerr a lot and my Zigbee mesh is rock solid. Also I have a Conbee II running to map the network (the Conbee is a nice option as you can update the firmware on Ikea devices while still on the Hubitat network with some caveats). They show up as end devices. There is a Zigbee 3.0 replacement from the HomeDepot that went through Zigbee cert a few months ago so I would guess these are being clearanced.
These are indeed HD / Wink branded devices. The EMBER_END_DEVICE confirms these are not repeaters. With the warnings from @mike.maxwell and @bobbyD I was prepared to return them but at this point, especially with your confirmation, I think they are a solid performer.
It was my better half that started finding places to install these devices and she has not been supportive of any the HA stuff.
@oscopeaaron Can you tell me more about your Conbee II? I would be interested in what you use to get your map and what information it provides.
Please report back any issue in about 2 weeks. Maybe HE is something else but they were dropping offline with me when I was with ST.