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A comment on Investing in lighting did great things for my mental and physical health. Parent comment

Re:Investing in lighting did great things for my mental and ... by goldenkey on Saturday May 28, 2022 @03:02PM (#31542778)
Seiko's US website has some PDFs if you do some searching but the JP website is a far better resource, and the products are international for the most part. [1]

You can read about the double aspherics here:

https://www.2020mag.com/article/double-asphericity-a-freefor...

[1] https://www.seiko-optical.com/fileadmin/media/marketing_shop...

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