Dimming also works flawlessly. As already described by other users is to hear a slight hum, this is but I think of inferior dimmers or on its nature. Because with an eco bulb with halogen lamps, I had this phenomenon also!
I hope now that life expectancy will be achieved and does not fail the bulbs previously.
The workmanship is very good, there is a plastic shield. The housing is made of plastic and I mean also not made of aluminum.
I would buy it again and again!