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...how old are the light fixtures. In the older fixtures the flickering can also be cause by bad starters. The starters (if the fixture has them) are the little silver-gray cans/tubes about the diameter of a nickle. They twist out and in and can be purchased at any hardware store.
If the fixtures don't have starters then maybe the ballast(s) are going bad or not capable of supporting the late-model bulbs. If that is the case it is sometimes less costly simply to replace the fixture totally.
If the fixtures don't have starters then maybe the ballast(s) are going bad or not capable of supporting the late-model bulbs. If that is the case it is sometimes less costly simply to replace the fixture totally.