Solexx VS Solarsoft 85 greenhouse covering

Solexx and Solarsoft 85 seem to be the best quality materials which
you cannot see thru for growing dank. The Solarsoft 85 claims
85%par light, and the Solexx claims 65% to 75% lighting with no mention of Par light. Does anyone really know which product
grows the best bud? I saw one website where a guy used a camera light meter on Solarsoft 85 and he claimed 55% of daylight, but not
Par light.https://www.icmag.com/ic/images/smilies/dance013.gif

good question.

table 1 of this reference notes that polyethylene has the greater P.A.R.:

http://www.hrt.msu.edu/energy/Notebook/pdf/Sec1/AJ_Both_Greenhouse_Glazing.pdf

and from the Solexx f.a.q.:

"What are the differences between polycarbonate and Solexx panels?
Solexx greenhouses are made with polyethylene. Polyethylene is much more flexible and is easy to cut to any size. Polycarbonate panels tend to be thicker, but have a lower insulation factor than polyethylene. Both materials diffuse light, but polycarbonate diffuses less (because it is more transparent), making the greenhouses much hotter in the summer. Polyethylene is very easy to clean and will not scratch like polycarbonate. Polyethylene does not contain BPA's that are found in polycarbonate materials and Solexx does not scratch"