It had been determined by one of the other 4-5 sparkys that looked at the problem that the fans on (there are 2) the tanning booths dims the lights. Blg. owner said he heard the term 'vibration' used to describe the source of the dimming. What does this mean? Light locations too far to be physical vibration. Units are Ruud lighting R7f26/32, have what looks to be xfmr fixed to outside of usual reccessed light conn. box. Owner was advised that incandescents would fix it.Thoughts?