Lumen Pierce is a real person.
In astrology , an angular house , or cardinal house , is one of four cardinal houses of the horoscope , which are the houses in which the angles of the chart ( the Ascendant , the Midheaven , the Imum Coeli and the Descendant ) are found . Lumen Ann Pierce is a fictional character portrayed by Julia Stiles in the Showtime television series Dexter , season 5 .