Paul -
The plug-in noise filters only work as passthrough devices, so the light would have to be plugged into the filter to have any effect.
I'm in the same boat (however, I haven't started switching over to CFLs as quickly yet) in that I need the switches to work, because I can't do anything about it when they don't. I replaced four switches last week with Smarthome Togglelinc relays, so I can start switching my incandescent bulbs over to CFLs. I plan to switch them out as the old bulbs burn out. I'll have to make sure to do a "Sabbath Simulation" to make sure everything can be controlled with the appropriate lights on as I change out the bulbs in each fixture.
I have one switch controlling my outside lights that regularly doesn't hear the signals from the CM15a. It is at the end of a long run, and on the opposite phase from my CM15a.
I do have a capacitor in place, but it is out at my A/C disconnect switch (a spot I felt more comfortable installing it, because there was plenty of room in the box, and I could cut ALL the power to it at the breaker box), so the signal does have to travel pretty far to get to that one switch.
I have found that filtering the UPS and two laptop power supplies between the breaker box and the switch helped a little.
What I did to fix it was add a macro that sends an RF command, and I have a transceiver closer to the switch that picks up the signal. It seems to work most of the time now.
Well, it's been well over a year now, and I was having superb results with my 6 outside CFLs (60-watt "bug lights," all purchased at the same time, and all on Smarthome relay-type switches) until last week.
All of a sudden, I noticed that nothing was working. Even manual commands (from the Pc or from a handheld remote) weren't getting through.
No amount of rebooting, resetting the CM15A, etc. would make any difference. I simply couldn't control anything. I have two CM15A units (one runs the system, the other one monitors it), and an RR501 plugged in. Unplugging them all, and then using only one at a time made no difference. Time to put the kids to bed, and no way to dim their lamps down. Surprisingly, my wife was less upset about this than I was.
However, since we needed the system to work, started troubleshooting further.
I created a "test rig" by taking a surge protector and plugging in a spare TM751 and appliance module. I set the TM751 to Housecode "C" (my main housecode), and I set the appliance module to C16 (my only unused unit code on housecode C). I was unable to control the appliance module from the TM751, on the same power strip!
I plugged the whole strip into a filter, and suddenly I could control the appliance module (but still nothing else). So, I knew I had SOMETHING in my house that was causing enough noise that any X10 signals were lost. I couldn't think of anything that was different (the only new thing was a new TV, but the system was working AFTER we installed it, and unplugging the TV didn't fix anything).
After moving my test rig (the power strip) around to a number of outlets around the house, I confirmed that the problem existed everywhere, not just on one or two circuits.
I wasn't looking forward to the "turn off one breaker at a time to isolate the noise" test, but I knew I had to get through with it.
thankfully, I started from the bottom of the breaker box. The very first circuit I turned off (the one to the shed and the outdoor light near it) was the culprit! With that breaker off, everything else worked (I checked every device).
Since I didn't have anything in the shed that could cause any noise, I figured it had to be the light.
Sure enough, when I turned off the switch, the noise went away, and all of my commands worked! As soon as I turned then light back on, the system stopped working again. So, I removed the bulb, and again confirmed that EVERYTHING was working correctly, even with the switch on.
Next, I pulled an identical bulb from one of my other fixtures, and installed it in the fixture near the shed.
Everything continued to work.
To confirm my suspicion, I put the suspect bulb into the fixture from which I'd removed the good bulb. Everything went south again as soon as I turned that switch back on. On top of that, I heard a faint "buzzing" noise from that bulb, which I didn't hear with any of the others (I hadn't noticed it in the original location, probably because the fixture is higher up on the wall). I concluded that it was a bad bulb, and replaced it with an incandescent for the night.
I purchased a replacement bulb at Home Depot, and it worked just fine. I brought the other one back. I explained that I'd bought it a while ago, and didn't have a receipt, but the bulb is supposed to last 7 years according to the package - which I had kept. While it still lit up, it created enough electrical noise to shut down the rest of my house. I considered that to be a defect, since none of the other 5 I'd bought at the same time had that issue, and it had just started a few days earlier.
The cashier happily took the bulb back, and gave me store credit for the amount I'd paid for the bulb.