You won’t find many Z wave or zigbee battery powered lights because they run through batteries too fast.
Mr. beams has always been my favorite outdoor lights, but that’s exactly who ring bought for their new line.
If you can wait until mid April to take a look at them, if they can be turned on and off with an echo routine, which sounds likely, then you can use echo as the “man in the middle“ to control the lights.
Here’s the product:
And here’s the community FAQ on how to use echo as a “man in the middle”