While it is possible to play the music and flip on the lights, my question though is what is triggering these events to turn on the lights or play the music?
I’ve also been leary about putting a smart light switch in my bathrooms to avoid humidity problems, I doubt that there would be enough to short out the hardware; but I don’t want to learn that lesson the hard way.
I’m also not sure about retail business and openHAB working from a legit licensing stand point; there might be no issue at all but it might be worth ensuring you aren’t violating anything before tackling the tech side.