Hey
@Ema26!
I've been growing under HPS almost 2 years and I've never notice anything that could be a buzzing/rattling noise.
I got some friends that are still under HPS an neither heard about that. I would recommend you to ensure that conections are well made.
Check the driver and the bulb. That could be a bigger problem later on.
Be careful! If you can do a cross-test would be the better option. (cross-test: try the bulb on other driver or the driver with another bulb).