Sorry - I don't have an answer, but I do have a related question: I want to replace some 3-way hallway switches with X10. I did this a few years ago, but in my new house there's a twist. First, I need decora-style plates. This isn't a problem. Second, the lights I'm switching are fluorescent. I'm already using some X10 relay wall switchesto control outdoor fluorescent lights. What I'm confused about is finding a companion switch to go with the relay wall switch.