Being a complete novice in the field of lighting i cant really answer your question. I am however a student of computer animation. I can tell you that in 3D animation studios, there are people whos sole job it is to deal with the lighing of sets as it is often a very technical and time consuming task, as im sure it is in traditional cinema.
If a DP (i have no idea what that stands for, im guessing its a cinematographer/lighting guy) was to join an animation studio to direct the lighting he'd definately need to work with the digital lighting guys. While real world and digital lighting have lots in common, there are big differences like the use of negative lights (as you would imagine, they do the exact opposite of light, ie. make things darker), and the ability to exclude object from a light sources illumination.
there are whole books written on the subject of digital lighting that im sure would shed some light. (that was rank, i know)