You can use an isolation transformer to stop the interference with other electrcal appliances or a realy good battery backup system. also T5's can interfear because of the frequency they operate as in not cycles per hour. florecent lights and Hi output lights work at different frequencies and can afect different things differently. Tig welder can interfier with radios up to I believe it is around 1 mile or so exspetaly if the building grounding is poor. or coroded.

Bill