When I built my current booth, I cut a slot in the top and have a 12 inch flourescent bulb shining down through the slot. I have a piece of acrylic covering the slot on the inside surface. I made a bunch of "tear-offs" from a roll of that clear packaging tape. Every so often when the topmost layer of tape gets too full of paint, I tear it off for a fresh surface.
Tear-offs (dirt track auto and cycle racers use them over their visors). They are clear sections with adhesive backs and laid on several thick over the visor. Cut each piece a bit longer than the slot, double back a half inch or so to get a tab to grasp, and apply about six of these over the clear acrylic. Tear off the outer one as it gets paint covered.
I just use a regular bulb in the florescent fixture- no fancy sunlight types.