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Photone - Grow Light Meter
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Photone - Grow Light Meter: The Most Accurate Light Meter App for Plants
Photone is a free iPhone app developed by Lightray Innovation GmbH that measures photosynthetically active radiation (PAR) as PPFD in µmol/m²/s, calculates the daily light integral (DLI) in mol/m²/d, and measures illuminance in foot-candles or...