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In need of Help on Lumen (lux) transmission through tinted plexiglass greenhouse

 
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I have the tintend plexiglass I got free onto my greenhouse.  I have been a little worried about the tint and how it will impact plants growing. I downloaded a light meter app and did a little test.  Outside it said 75000 lux and inside it was 25000 lux, in very rough numbers. A difference of 50000 lux has me concerned.  That being said is the tinted plexiglass only blocking certain parts of the light spectrum and letting what the plants need through but not the brightness?  I have tried researching online and I can not make heads or tails out of what I can find. I am hoping that there is someone one here who can help me out.

Thank you for your time and sharing expertise.

Regards
Brayden
 
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