Lighting Ballast,2-1/4" W x 1-3/16" H Bulb Watts 10.4 W, Initial Lumens Fixture Dependent, 90 min Emergency Illumination Time, CA Title 20 Compliant Yes, 15 3/8 in Length, 2 1/4 in Width, 1 3/16 in Height, Standard Profile, Galvanized Steel Housing Material.