Here are the results from the iPhone app - Photone (led mode purchase - iPhone pro 14 - diffuser) - a $170 PAR meter and the $560 Apogee MQ-610 meter.
I originally did this comparison with standard copy paper - which is 22# weight. After posting my results on Reddit, a developer asked me to try some different paper. What I learned - if you are going to use this app to measure PAR - it seems to be very accurate - even compared to the high end Apogee. HOWEVER - the developers should/need to mention that in order to get accurate results you MUST use 22# paper, which is not standard copy paper.
The instructions in the app say "Use regular matte white printer paper (22lb or 80g/m2) - 22lb paper is not the standard paper, and most users are most likely not going to have it readily available.
Негізгі бет Phototone PAR Meter App test vs Photobio vs Apogee
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