This is a 220 watt fluorescent 2 light, dimming kit , each fixture consisting of a 110V AC electronic flicker free on-board ballast, clip on/clip off main reflector with open face measuring 5"x23", two high intensity 55 watt 3200° K wands and two barndoors with lifelong computer hinge. Each complete light is mounted on a ball and socket joint terminating in 7/16" diameter x 3" stud.