At first I was very satisfied with the items Pears, for almost 10 gets you a beautiful, energy-saving lamps. I've been looking for extra-dimmable lamps and was really satisfied first. The problem is that the pears begin after a period of operation giwissen growl. I have the lamp hanging above the dining table, and it's really annoying when after about 1 hour operational ertön hum. The sound hang on the setting of the dimmer, but not completely silent!