i know you don’t want edge lit, but have you tried edge lit LED sheet?
ive been buying in clip-frame LED poster holders from Robert Horne for a while now. they are excellent… about 10mm thick, full back-lit illumination. can be fixed to a wall or hung in the window. come double sided also.
I know Applelec have an LED sheet too. but ive not had a chance to read up on the product yet.
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