Those lamps are quite sensitive to RF fields. One of my neighbors has one of those wretched things. When he decides to use it, I just fire up the 100W rig, and key up a few random carriers in sequence. That sequences his lamp in varying brightness, and he eventually unplugs the thing in frustration.
All my neighbors run RF trash producing junk. I have a contant +20dB over 9 roar of buzzies, warbles, farts and raspy hum all over HF. When ever I key up a nice carrier, I can hear all these signals shift around and settle back to their natural frequencies, when I unkey. It's quite amusing. Sending CW must cause quite some kind of disruption around my neighborhood. I can't wait untill I get my big 1KW big rig online. maybe that'll just blow up all that junk, once and for all. Ed, VA3ES