For many years I used 1220 X 2440mm Polyproylene sheet from Amari, 2mm thick if I remember correctly. I could get it to last several months using both sides, it’s an off white opal, not clear, but it does allow a fair bit of light through and it isn’t expensive. See if you can get a sample?
I know the stuff, used to use it before on normal tables as a cutting mat but doesn’t allow enough light through for the light table and also don’t think it comes in the size needed as needs to be a single piece for a 4.8m long table.
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