They work with X10 as long as you get the right switch. It has to be
the one that can handle any loads, not just incandescent. As others
have said, these have a relay inside that you can hear click on/off.
My Intermatics are old and all emit clicks indicating
Some electtronic switching gets its operating voltage through the
load. CFLs do not allow any current to pass through when they are off.
I dont know about timers in particular but have had this problem with
photo cells that switch lights on at sun down. I was thinking about
installing a small resistor in paralell wih the lights to see if it
will provide enough operating current for the photo cells. I havent
tried this yet but I expect it may work. I have gotten this to work by
replacing one of 4 lamps with an incandescent. YMMV
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