Greetings from NYC.
I have been using X10 since I was a boy and it was branded as BSR and my dad bought a few modules to control floor lights in suburbia when nobody was home so the place wouldn't look empty. So I've likely had over forty-five years with it. Which likely just makes me old...
For about fifteen years I've had an X10 setup in my apartment to control lights (a mix of floor lamps; ceiling lamps used for my tropical plants, and cacti and succulents; and string lights) and table fans (one per room). These lights are now nearly all LEDs. I have about 16 modules split over different house codes. It is working less well now than it did when I started, which is confusing. Hence my showing up here to ask questions and get some help.
I'm using the white HR12A remote control with the RF receiver (the TM751, RR501, or IBM HD501, I think that's all of them to convert RF from the remote to powerline signal) and three-wire appliance modules with a few two-wire lamp modules. Plus the 15A power-line filters on my tube LEDs for the plants, since there are turn-on/turn-off issues, and some hanging, with them. The standard HR12A remote won't turn the lights off, but the KC674 keychain will. I think this is a noise issue.
Anyway, I will separately be posting about my issues in the appropriate forum, which is why I'm here. So that's my introduction.