from neptune's site
4. Why do my power compact florescent lights turn on when they should be off?
The CM466 control modules have a feature called 'local control', which allows the control module to turn on when it detects that the appliance plugged into it has been manually turned on. To the control module, some electronic ballast appear to be going from off to on and so the module turns itself back on even though it has not received any X10 commands to do so. There are two options to solve this problem.
Plug an additional load (i.e. fan, AC transformer, etc.) in parallel with the problem ballast
Perform surgery on the control module to disable the local control feature. Follow the steps below:
Use a Phillips screw driver to remove the screw between the plugs of the module
Carefully pull the plastic clam shell apart. Be careful to not loose the X10 address setting dials
Remove the printed circuit board from the plastic clam shell assembly.
Refer to the diagram below and cut the wire jumper with dikes.
AM466 Module X10 Pro Module PSC02
Install the printed circuit board into the plastic clam shell assembly.
Put the plastic clam shell back together making sure that the X10 address setting dials are properly seated
Use a Phillips screw driver to install the screw between the plugs of the module