In its original American broadcast, "Black Light Attack!" was watched by 5.014 million households, according to the Nielsen ratings system. It received a 2.3 rating/6 share among viewers in the 18–49 demographic, that is 2.3 percent of all people in that group, and 6 percent of all people from that group watching television at the time, watched the episode. This was a decrease from the previous episode, "Klaus and Greta", that aired the same day of the week, which was watched by 5.122 million American viewers. The episode's rating constituted a 30 percent drop from the December 10, 2009, airing of the "30 Rock" episode, "Secret Santa", to a season low 2.3 rating. Nonetheless, "Black Light Attack!" was the third most viewed episode on the NBC network that week. Jane Krakowski received a Primetime Emmy Award nomination for Outstanding Supporting Actress in a Comedy Series at the 62nd Primetime Emmy Awards for her work in this episode, but lost it to actress Jane Lynch.