Hi,
I have to use a voltage converter for my D2 head. I'm using a Zone VI timer on the light side only. The heater lead is plugged directly to the voltage converter. I have used this method with out any issues. My converter has stabilizer and overload built in. I also had a look at the head it has nothing on it. 100 watts is going to give you about 1 amp (.909 @ 110Vac) I would just run the light not the heater through it. I know this doesn't give you exact answer, yet. if it has overload protection plug it in.
Pat