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unbalanced loads.
I would check my source (voltage) to the lighting. Also, I would check all my connections, especially my nuetral.
Install a voltage recorder and leave on connected to all phases for approximately 72 hours (day and night).
I would have checked for a loose phrase connection at the panel feeding these lights. In a plant there are many vibrations that could cause dimming and low light output by moving a loose phrase or neutral conductor.
Panel maintenance should be part of the preventative maintenance plan as i have found that dimming, flickering lights can typically be remedied by tightening up a loose neutral. Any time i am in any panel i tighten every screw. When i told the local inspector what we do he asked that we torque them to spec. We have also found that heat kills; so on all our surface mount fluorescents that do not have any air space above the ballasts.. we re-install ballast by running the mounting screws thru 1/4' nuts above the ballasts. The ballasts seem to last 'forever' with air flow around them.
Start with the easiest sollutions first . loose connections on your neutral , or phase conductors , call power company too check line power .
Check the circuts the the lights are on plant probably means three phase a loose neutral could effect a whole lot of lights and could burn up a lot of ballast.
I hope that the inspector explained that over tightenig the connection isn't good as well.
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