Emergency Lighting System 20 Watts @ 90 Minutes Lamp Quantity 2 Lamp Type LED Lamp Watts 10 Fixture Wattage 10 Voltage 120/277 Yes Lamp Included Failsafe Battery Backup Gas and Dust Explosion Proof 50 000 hr LED Life Housing Material Cast Aluminum Housing Finish Powder Coated Mounting Wall Nickel Cadmium Battery Type 24 Hours Recharge Time Ambient Temp Range -40 Degrees to 50 Degrees C Length 35 In. Width 28 In. Height 21 In.