Can this be installed on a sloped ceiling? Yes. The connection between the pole and the ceiling plate is flexible and rotatable. Is the pole of this lights adjustable? The pole of this lamp is composed of three sections of poles of different lengths, and you can match the length you need. How to adjust the length of the pole? The two poles can be connected together, so these three sections can be matched like this: A, B, C, A+B, A+C, B+C, A+B+C . That is to say, 7 lengths can be matched.