I think it is the beat frequency between your shutter speed and and the lamps frequency. Try changing the shutter speed and it will go away. You might even have a setting for this on the drone.
Hello there SnowSkier Pilot. I am sorry for the trouble this has caused and thank you for reaching out. As posted above, kindly please try changing the shutter speed on the DJI Fly application to see if the issue will still persist? Thank you.