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Hi, I'll try to address the specific question you asked.. Having diffusion material on top and in back, and NOT on the sides is OK if you only intend to do lighting "from the back". Having all the lights in the back, or top area works fine for most shots. Just make sure you don't have any ambient light, or reflections, "creeping" in from the side area's.. Sooner or later, you are going to want to experiment with side, or front lighting, and in those cases you'll probably want to diffuse those lights too or they could overpower the other sources.. In the case of front lighting, it needs to be placed farther away than diffused sources... Best of luck.. Richard Slaughter
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