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Introduction to Radiometry and Photometry?
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3 points
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18th Jul 2021
LOL...this isn't how it works. Those numbers have a different luminous efficiency (which is different than luminous efficacy).
640 nm is 0.175
670 nm is 0.032
The 640 nm LED will read over five times higher with a lux meter although the PPFD may be the same. When I keep saying that you don't understand theory this is what I'm talking about.
https://imgur.com/a/TYMER luminous efficiency table from the book, "Introduction to Photometry and Radiometry".
https://www.amazon.com/Introduction-Radiometry-Photometry-Ross-McCluney/dp/1608078337
If you already know the PPFD, which most people won't know, then what's the point of using an app that that will not be cosine correct unless you buy a separate meter?
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