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Old 11/03/2019, 03:08 PM   #1
Bryan
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Join Date: Nov 2000
Location: Vancouver, Canada
Posts: 1,734
PAR PPF PPFD and PFD Explained

Geared towards horticulture, but very good information, especially as the hobby has moved to LED lights. Apogee makes the test instruments so I am pretty sure they know what they are talking about.

https://youtu.be/UZO8Fb0ryW8


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