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PPFD(umols/m/s^2) is what most lights I have seen are spec’s at. Around 500-700 umols/m/s^2 is what I have seen recommended for veg. 900-1500 for flower unless you supplement with CO2. Does the app have units of measure? I have an app and it says to put a diffuser(like Scotch tape) over the camera lens to use it.I found a "PAR?" meter app for my phone. I'm sort of searching threads now for what I should be shooting for. Lots of threads out there... Hmmm. Any suggestions?