15 that are fixed for movement with the platen 13 reflectors 16 are mounted on the frame 12 in partially surrounding relation to the lamps 14 a chain drive mechanism broadly indicated at 17 is mounted on the frame 12 and operably connected to the movable platen 13 the chain drive mechanism is manually operable to move the platen 13 forwardly and rearwardly relative to the frame 12 movement of the platen 13 causes corresponding movement of the sockets 15 and their lamps 14 relative to the reflectors 16 on the frame 12 the controlled movement of the lamps 14 relative to their reflectors 16 simultaneously adjusts the beam angle of all of the lamps 14 in the array 10 the ends of a u shaped yoke 20 are pivotally connected as at 21 to the sides of the housing 11 and the frame 12 a mounting bracket 22 is at the center of the yoke for attachment to a supporting structure the yoke is pivotable about the housing 11 to selectively position the mounting bracket 22 at either the top or bottom of the array 10 in the illustrated embodiment the frame 12 comprises a pair of tubular aluminum shafts 23 and 24 extending vertically at the rear of the array in fig2 a pair of angular frame members 25 and 26 preferably made from aluminum extend across the rear of the array 10 and join the upper and lower ends of the tubular shafts 23 24 the front 27 of the frame 12 is formed from a sheet of aluminum 30 which is preferably one tenth 0 1 of an inch thick the sheet.