I have not backlit the actual film, but I did scan two transparency films to create digital files and then have those printed on transparency material that I mounted in a transom above the door to the master bedroom. The bedroom is off the kitchen, and the transom is visible from the great room. I taped the transparency prints to sheets of acrylic. There’s one on each side of the doorway, and two LED lightbulbs suspended in between.
Moto phone is a bit challenged here, but this may give you the idea.
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