Disassemble the parts of the photo frame leaving the frame itself intact. Slide off the back. Remove the cardboard filler. Remove the glass; you will reinsert the glass later.
Put the light socket inside the milk crate. Feed the plug out one of the holes in the side of the crate. Secure the light socket to the top edge of the milk crate with a zip tie. If you have a work light with a cage, you can suspend both the bottom and top of the light cage from the top edge of the milk crate using zip ties.
Line the sides of the crate with cardboard. If you prefer, wrap the outer sides of the crate with the cardboard instead. It doesn't matter if it's lined or wrapped as long as the cardboard prevents light from escaping through the sides. Tape the cardboard to the crate.
Cover the top of the crate with waxed paper to dull the intensity of the light. Secure the waxed paper with strapping tape.
Glue the photo frame face down to the top of the milk crate along the edge not covered with waxed paper. Reinsert the glass in the frame.