The funny thing is it goes away when the main headlamps are turned on. It is only when the parking lamps or no lamps (aside from fog) that it makes that humming sound. That is what my friends also don't understand. The sound goes away when the main headlamps are on. I will try the level of brightness though. No harm in trying. I used the factory ones to avoid issues like this but hehe, i guess nothing is 100%. Do you remember what you did to rewire them? In what manner? I was also thinking that it might be a voltage issue but why would they remain on. According to honda they should be off when the headlamps are turned off.