On the subject of Lighting in Sjinterfell Castle

I have no doubts that Sjin will find a unique way to light up the castle(a grand chandelier in the dining hall perhaps), but might I suggest a Magnum Torch? It'll stop mobs from spawning in a 128-block horizontal radius, more than enough to cover the grounds of the castle, and it makes for a nice decorative tiki torch if placed on top of a carpenter's fence with an oak log covering. That way, all the lighting done in the castle can be purely decorative, and you don't need hundreds of torches or magic fires littering the tables and floors. I think it only covers 32 blocks vertically, however, so depending on how tall the structure is, you might need a second torch.