They make both a dimmer and relay type
fixture module that goes into the electrical
box.
Near the top of the AHP Forums page; pick
accessories then modules.
Both are X10Pro Modules so on their web site
you can also download the users guides.
www,x10pro.com. May also be here didn't look.
XPFM is the relay type [on off no dim for
things like CFLs]
XPDM is the dimmer type fixture module.