The Lampades are the nymphs of the Underworld in Greek mythology. Companions of Hecate, the Greek titan goddess of witchcraft and crossroads, they were a gift from Zeus for Hecate's loyalty in the Titanomachy. They bear torches and accompany Hecate on her night-time travels and hauntings. Some accounts tell of how the light of the Lampades' torches has the power to drive one to madness.
The Lampades were probably the daughters of various Underworld gods, Daimones, river gods, or nyx. http://www.theoi.com/Khthonios/Lampades.html