We had a bit of this discussion last time. We have roughly 750 that you could define as lighthouses. Within that number, about 250 are the kinds of lighthouses you see on postcards. The other 500 or so are navigational aids, but they do meet the definition of lighthouses as well, depending on how broadly you want to define it.
I don't think we're seriously talking about the 750 being potential heritage lighthouses. That would drive the costs up to be....