OK, 72 views and no 'takers' on this one.
IMHO, harmonice are much more involved than can be addressed verbally, plus much more data is required. Are you using the existing lighting circuits/wiring?
Ballast data from the replacement fixtures is required, (THD), as well as any/all data regarding the other loads within the structure. Most, if not all available ballasts (OEM) are within industry minimum-maximum values. Info on the lighting circuits, number of conductors, AWG of hots & neutrals, etc. As you mentioned VFD's and motors, are you concerned about the service? Feeders?
Are you concerned for liability issues? Is there a design professional (engineer or architect) that specified the fixtures? Or, is this just a 'swap out' one-for-one job with energy efficiency the driving force?
