I don't think so, the popular ones that I am aware of need an internet connection to process what you say. And obviously your LED lights would also need to work without WiFi.
I wanted to check in and see if you managed to see Cathal_S post? Please let me know if you have any questions from here. I would be happy to assist, and ensure you are good to go.
I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.