A Trying to source Photochromic lenses based on laboratory data

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Photochromic lenses analyzed in a laboratory using a spectrometer have not been matched by various Chinese manufacturers, who instead provided similar materials. The inability to replicate the exact specifications may stem from differences in manufacturing processes or material availability. To resolve this issue, sourcing from German or American manufacturers is recommended, as they may have more advanced technology or better quality control. Additionally, providing detailed specifications and laboratory data could help in achieving a closer match. Exploring alternative manufacturers or technologies may also yield better results.
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Photochromic lenses
Hello,

I have a photochromic lenses that I analyzed in a laboratory using a spectrometer. I sent the obtained data to various manufacturers in China, but for some reason, they are unable to produce an exact match. Instead, they sent me a similar material.

What could be the reason for this, and how can I solve this issue?
 

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Try German and/or American manufacturers.
 
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