It used to be my homemade "cold light". I took a PVC 6" T fitting and put the biggest compact fluorescent that I could find horizontally so that the coils were above the vertical opening. Made a reflector above and a diffuser below. Then taped the whole thing with gaffer tape until it was light tight.

It actually worked OK (fell off at the edges), but I chucked it and started looking for a real cold light.

I'm in the middle of a print washer made out of a big plastic tote.