RF shielding?

do most ballasts come with a RF shield output cord? If they dont they tend to cause interference with your tv, radio, etc. I am trying to buy a light set up and am not completely sure what to get, any tips will be greatly appreciated. My space is about 4x4, 4 ladies in 5-gal. Looking for a 400watt HPS MH multiple wattage e-ballast, preferably dimmable and can use HQI bulbs.
 
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