The EM-LED HALO is a sqaure surface mount standalone emergency LED luminaire which incorporates either our open area or corridor LED optic. The unit is designed for non-maintained use. This product operates with the latest LiFePO4 batteries that offer a long life and a low parasitic load. The main LED is driven at 550mA and provides either 250 delivered lumen with the open area lens or 241 delivered lumen with the corridor lens.