Topic: Luna moth migration???

A friend of mine has puzzled me. He says he's heard that there is a proliferation of luna moths in Cape May at some point during the year. I know Cape May is a migratory route for butterflies and moths but is there a best time of year to see this phenomenon? A certain location? And what about this luna moth thing? I can't seem to dig anything up specifically about luna moths on the 'net. Thanks for any info!