Ghost Moth 'Spectacular'

Last night returning from work at dusk,I noticed a Ghost moth flying in the headlights, I stopped the car and put the headlights over the field where it was heading it was amazing to see Ghost moths everywhere I counted no less than 48 males and 8 females 'Lekking'over the field .I returned an hour later and found none.Will try againd tonight nothing special about the field just a mix of Dock,Sorrel ,Buttercup,Nettle and various grasses.