Well normally, the E-ballast will say if it can do HQI bulbs, but besides that fact, yeah, you basicly got it right. Remote is heavy for it is magnetic, where the E-ballast is light enough to put in the hood, you don't have to put it in the hood if you don't want, just light enough to.
Of course I could be wrong, since I have only read the ordering forms, not actually had them in my hand yet.