Hmmm.
Not exactly what I was referring to. I would want a light to indicate some condition, then the button would perform some action. The two do not have to be related to each other.
So I walk in the house. The blue button on the wall is lit up, indicating that I have that email from my brother-in-law that I was waiting for. I push the button, launching a small nuclear strike against the country of Alfredamonia. (Or for a more prosaic situation, the light is lit up telling me my server is overloaded. I push the button to spin up another server)
It's a neat idea. 100 bucks is crazy expensive for something you should be able to order by the thousand from China. Going to need some serious early adoption folks. I would look to the Agile IT guys -- lots of those folks would want some big, physical indicator to show something and some simple way to interact with externalities.