"If this helps you may want to install a proper shielded cable."

Good advice!

Greenfield flexible conduit between the ballast and bulb should tame it.

Any shielding solution will require a proper ground.
So buy a cheap Led, outlet tester and use it to check your ballast's outlet.
Your solution could be as simple as tightening the main grounding clamp at the service entrance or swapping the hot and neutral leads.

Aloha,
Weezard (retired IBEW)
Weezard Reviewed by Weezard on . RF Interference Hey Guys so I recently went to digital ballasts and am having a hell of a time with RFI. I am not in legal trouble because I am a carded user and their is nothing the local authorities can do to me. I am how ever experiencing some RF interference and so is my neighbor. Anyone got any tips and tricks on how to fix this with digital ballasts? My light is away from the ballast , it is in the tent. I have thought about shortening the power cord from box to power outlet. Rating: 5