Proper illumination to exit a premises during a power failure is critical for safety. The Emergency Housing with integrated test button & driver with battery back up provides an amazing 1000 lumens or 100% of illumination (3 series) for 90 minutes. If greater lumen output is your requirement, the Emergency Housings have a 2700 Lumen output capability when using the 9 Series product. Normal operations will witness the luminaire smoothly dim down to 10% using 0-10V dimming protocol, a perfect match to all other 0-10V Lightheaded products. Also available for commercial spaces utilizing 277V input power.