It's really not that loud, at least mine aren't. The bulbs have little fans on them to keep them cool and that's what you hear. There are others out there without the fans if that is a concern. It's a new noise that was not there before and the only time I can hear it is when the lights come on with the engine off. Like when you unlock with the remote or open the door (I have it set so all the interior and exterior lights come on when a door is unlocked or open). Can't hear it after the engine starts.