Anglerfish commentedweek 423d ago
@GeezandDraht,
I was using an app called Photone to measure PPFD, but I was worried that it wasn’t actually accurate so I bought a PAR meter off of amazon for 80USD. The app on my iPhone was reading slightly higher PPFD than the PAR meter, but not by a lot. I think you’re safe using your iPad to measure it.
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