This pencil type photo sensor has a thin cylindrical shape and fits neatly between twin floodlights or other tight applications. It typically mounts on fixtures or boxes and has a weatherproof polycarbonate housing. Its field adjustable swivel base makes it easy to direct the photocell away from stray light and its heavy-duty thermal bi-metal switch provides a 30-60 second time delay to eliminate unwanted lamp cycling that could be caused by lighting or car headlights.