Collected at night on a black light setup. It was glowing at the time, but this and a couple other specimens weren't glowing next morning during daylight hours photographing them. I never saw any that were pulsating. I believe I kept this specimen in a darkened container to try to induce it to glow, and it worked. Apparently there are at least 4 species of Elaterid in the US that glow like this, found in Arizona, Texas, Florida, Georgia. The 3 in Bugguide seen in Texas and Florida are in a genus Deilelater. I do remember encountering one only one other time in my life in either FL or GA glowing at night on the wall of a gas station, but never in my home state of PA.