just be sure to tape off or insulate any unused wires because they will have back feed voltage on them when blower is running...(dont ask how i know this)
Ryan The shower light is a recessed can type that has a thermostat type protector that shuts lamp off from high temp. then back on once things cool off
A normal light lay out for 3 rows would be 80 inches from wall to 1st row,then 160 inches from 1st to 2nd row,then 160 inches from 2nd row to 3rd row,which should be 80 inches from 3rd row to other wall..... 80+160+160+80=480in.x 12=40ft