Utilizing the Pipehorn's ultra-high frequency (480 kHz), I'm able to induce a strong signal on the underground wire feeding a parking lot light. This method could work for locating streetlights, as well. The photocell sensors, when off, can create an open and an ungrounded end on the conductor. Ring clamping and direct connecting to live power lines sometimes isn't an option. Also, sections of wire between poles and/or the building can be short (50-100 ft). All of these obstacles make it difficult for lower frequencies to get a good signal on the line. The Pipehorn lit-it-up (pun intended) saving me time and effort. Please share this video with those who have trouble with "unlocatable" parking lot/streetlighting.