Core exhange wouldn't really be possible because most old lights (at least 6 months) look a whole lot worse than the "new" lights we'd provide you. So it wouldn't be a fair swap.

More likely scenario is you would send in your lights and we would do the work.
Total for the complete project would be $599, but $399 intro for first 20 people.
that would include shipping, handling, install, and parts.