AF4-IA:4" Fluorescent New Construction IC Airtight Housing
-Ceiling cut-out: 4  5/8"
-UL listed for feed through wiring and damp locations 
-Adjustable hanger bars allow the housing to be positioned at any point  within a 14"-24" joist span
-Through branch wiring (4 in-4 out)
-Magnetic ballast 120V/277V  1PL X18W
AFE4-IA:Electronic ballast 120/277V 1PLX13W/18W/18W/26W  4pin