I record audio using 2 microphones connected via XLR cables to an audio interface, and behind the microphones I always have a ring light turned on. I live in Europe so everything I have has the EU power plugs except for my ring light, which came from the US, so I'm using a US to EU adapter to plug that in.
To my problem: I noticed that when the ring light is turned on and is near the microphones, my recordings always have an electrical hum in them around 50hz. The closer the ring light is to the mics, the louder the hum. When I move the ring light away from the mics, it reduces the hum but not completely.
Is there a known solution to a problem like this that will completely get rid of the electrical hum? I have read something about DI boxes or ground lift switches, but because I don't know anything about these devices or electricity, I'm not sure if something like that could help.
Thank you for any tips you might give on this issue.