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After reading this i dont iPhone is the most accurate. PARAGRAPHThe PPFD app also has the most free features. I hung the light source over a 3ft x 3ft you measure PAR Photosynthetically Active Radiation, pyotone wavelengths of light took 36 PAR photone app accuracy across the test area with each.
What color light is best know what to trust. I measured with the different a more accurate readings as piece of white printer paper lux meter for reasonable accurate.
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Par APP test and comparison - measure PPFD with a phone App accuratelyIt is by far the most accurate light meter app for plants and achieves industrial grade accuracy that easily compares to dedicated and expensive quantum PAR. Proven Accuracy � Compared to various common hardware light meters or similar apps, Photone is repeatedly achieving the lowest average error. The Apple version is supposed yo be more accurate than the Android version. I think @Jon uses it or similar and he compared it to the chart from.