22lb 98 bright for photone on iPhone…
Good luck finding it though it’s the most accurate and is around 10 points under what a ppfd reader will read.
Let’s say 550 ppfd is on the photone app setting with 22lb paper, the ppfd meter will read around 560. Which is amazing considering it’s a phone app. Using the paid LED option is a little more accurate.
If you use 20lb it’ll read about 200 points HIGHER on the photone app (using sun setting) than what a ppfd meter will read. Meaning if the photone app says 550 ppfd and you are using 20lb paper, it’s actually around 350 ppfd.
Now if you pay for for LED option it will read about 100 points different with the 20lb paper.
Actually here is a comparison I did. I’m not sure what kind of paper it was but it definitely wasn’t the right paper.
This video should also be helpful and more informative