My cheap 4' 2 bulb fixture I got at home depot for $8 is quiet as can be. Also, my Coralife 96w PC
light is absolutely silent. In fact, I think all my stocks lights are not even audible.
I must say though, I bought 4 of the 4' 2 bulb fixtures and one out of the 4 is noisy but it is in the garage over my workbench.