Nick Rudgard asks this question, which concerns interference problems to a radio caused by a domestic LED downlight installation. It has been answered by Philips (Theme - Lighting):
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Question: I’ve just installed 14 (non-Philips) LED downlights in a customer’s house, but when the lights are turned on they cause severe interference on the customers radio. I’ve tried one of these lights at home with my own portable radio and it has the same effect, but if I connect an external aerial to the radio, it is fine.
Note that these lights are spread over three rooms, so the customer does not want the expense of installing aerials in every room.
Has anyone else come across this problem, and have they found a solution?
Answer: Any light fitting or lamp sold in Europe should comply with standards relating to electromagnetic interference. However, these are tested on a reference or standard circuit, and once you have them installed there are many other factors affecting the electromagnetic environment.
If there is a transformer on the downlight, you can try changing it to one with better EMI suppression.
Keep any cables as short as possible, and consider using shielded cables from a company such as Belden.
Consider also using a EMI filter on the power supply or between the transformer and the lamp.
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