Columbia Lighting VersaBay® High Bay Fixture, Linear Medium Lumen Solid Top Wide, Series: LLHV, 120 to 277 VAC, LED Lamp, 138.4/144 W Lamp, 4 Lamps, 60000 hr Average Life, White Light, 4000 K Color Temperature, 0 to 10 VDC Dimmable Driver Ballast, 16313/18685 Lumens, Suspended Mounting, Steel Housing Material, Baked Enamel Housing Finish, 48 in L x 16-3/16 in W x 2 in H Dimensions