If trying to match sun light (coming in from window) I just put the Blue Gel (CTB) on the light (Halogen pepper light). This will basicly match lighting right?
Yes. A good color temp meter and a few rolls of Rosco can match almost anything to anything. Also, unlike with film, one can do some creative work with setting the White Balance in the camera, though you will want your light sources to be close to in balance.