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Hey DGC, Found a lighting app for your  smart phone called PHOTONE. This app can be used to check PAR and DLI. This app has a calibration feature. I use HLG lights in my grow and trust their PAR charts. They can be used to check calibration. I like to keep PAR between 200-400 PPFD during seedling/clone stage, 400-600 for veg and, 600-900 for flower. I would not want to use for testing but is a nice tool for the grow. App is very inexpensive. Would love to get a trusted review from GURU.