Pulses are sent by the power company on fixed moments of the day to switch between day and night setting. Also vacuum cleaners can, at fixed moments, create disturbances on the net when started. However, this effect is not harmful to the product.
How can I prevent interference with my audio installation?
It is possible that interference occurs if power-wires are combined with speaker wires. This can be prevented by creating a larger distance between the 2 input wires of the lamp and the audio installation.