Quote:
Originally Posted by Nematode
One polycarbonate sheet will eliminate almost all light below 400nm.
Adding a second sheet cannot reduce this further.
However if one sheet has 80% transmission in the spectrum you want, two sheets will cut that to 64%.
This would not hurt in the spring, but can be an issue in the fall and winter when the sun is low and weak.
Hope that helps.
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Irregardless of the effect on taste, you've actually answered my question Nematode. Because I've already eliminated almost all the UV, another layer of polycarbonate won't make any meaningful difference. Thanks for the info.