There are a couple problems with electronic ballasts.
You have seen noise generated by the ballast, this could be resolved with a plugin filter. Plug the ballast into the filter and the fitler into the x10 module.
Also when some ballasts are turned off they are immediatly turned on again. You can fix the issue with electronic ballasts by putting a splitter on the X10 module, plug a night light and the ballast into the module. The electric surge given off when the ballast is turned off will travel to the path of least resistance and light the night light. I think that was mentioned in one of the links I have posted.
-nick