The DM-105 is a control module which is used to switch HID High Intensity Discharge lamps high to low and low to high. The DM-105 bases its bi-level switching on signals received a controlling device. With the DM-105 and an occupancy sensor, HID lighting will switch to a lower, energy saving light level high to low after a space becomes unoccupied. Then, as soon as the space is occupied, lighting will return to full brightness low to high .