Home, Lawn & Garden Insects & Pests
If you've seen hornets attracted to lights at night, most likely it is the European hornet, Vespa crabro. This species can be quite intimidating as they buzz and beat against lighted windows at night. They are very defensive, so be sure to maintain a safe distance between you and the hornet.
"SP290-A-European Hornets Tapping at Your Window at Night," The University of Tennessee Agricultural Extension Service, SP290-A 10/06(Rep) 07-0064, http://trace.tennessee.edu/utk_agexdise/21