The Müller-light LED lamps were not purchased through Amazon. That's why I not read the reviews here. Otherwise I would not even buy this because of the reviews only.
Test, I've assembled the first two ceiling lamps with LED lamps by Müller and could find no complaints. Therefore all LED lamps were freed from their packaging. It was carried out the installation and disillusionment.
Of the total of 26 LED bulbs are only 8 usable. Six are inaudible and only two had just warnehmbar. 18 pieces humming between audible and unmistakable. In lamps with two lamp sockets the hum is still much louder than in the lamps with only one version. I use almost exclusively lamps with two versions.
Since there is no guarantee that the 8 LED lamps do not start even with the time to hum, I have revoked the complete purchase of cheap Müller-light LED lamps.
Quality is LED lamps well but at a price.