If there are specifications detailing particular ballasts and the contractor didn't provide them, they are in breach of contract. They were awarded the bid based on the specifications and may well be trying to save money by cutting corners.
I would be screaming bloody murder at this
point to get a 3rd party to inspect the fixtures to see if they meet spec's, though I would first go check the spec's to see if the
theatre consultant actually included these
Mark 10's in the bid document specifications.
It still might be a whole lot easier to s_ _ t can the whole lot down the
road and install something better. Best wait for some mucky-muck to complain a lot about the light show at 10%, then make your case.
Steve B.