Try the Playstore and search ppfd, I use it and it does work well, I cross checked the app on three different phones and got the same reading. I'm sure it is not accurate like the $$$ Apogee and it maxes out at 965 ppfd. For the price it is a lot better than just a generic manufacturer recommendation graph. It also has the DLI feature which is nice. Maybe Mr. Grow It can cross check its accuracy against his high dollar one....
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Try the Playstore and search ppfd, I use it and it does work well, I cross checked the app on three different phones and got the same reading. I'm sure it is not accurate like the $$$ Apogee and it maxes out at 965 ppfd. For the price it is a lot better than just a generic manufacturer recommendation graph. It also has the DLI feature which is nice. Maybe Mr. Grow It can cross check its accuracy against his high dollar one....