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Only reason I’d be concerned is them things ain’t cheap so I’d expect it to be accurate! I’m only using a $5 iPhone app to measure my ppfd but it was tested against apogee quantum sensor meter and was within 11% of quantum sensor and held at 11% for iPhone version of app if u use a full spectrum light with white and red diodes so I just gotta multiply my apps reading by 1.1 to get actual ppfd! For $5 does the trick for sure!Feeling pretty gutted today, my brand new Apogee MQ-610 is faulty apparently.
Low light applications affected by zero-offset calibration error in some meters
On December 9, 2021, an internal Quality Control Audit determined a small number of Apogee handheld pyranometer, PAR, and ePAR meters may have shipped with a zero-value offset that was outside of our published specifications. This means some meters may not be reading within the ± 5% advertised specification when measuring low light levels. Please refer to the table and search tool below to determine if your meter is in the affected group and if you are measuring low enough light levels to be concerned.
Should I be concerned growing cannabis, or isn't it a problem, anyone know?
Normal Specifications Possible Low Light Error Quantum Meters ± 5% (0-4000 umol m-2 s-1) ± >5% (0-200 umol m-2 s-1),
± 5% (200-4000 umol m-2 s-1)ePAR Meters ± 5% (0-4000 umol m-2 s-1) ± >5% (0-200 umol m-2 s-1),
± 5% (200-4000 umol m-2 s-1)Pyranometer Meters ± 5% (0-2000 W m-2) ± >5% (0-100 W m-2),
± 5% (100-2000 W m-2)
This is new Mars light at 70%
X1.1 = 766 ppfd
Light at about 85% power
X1.1= 1116ppfd! Not bad for being prob 24” or so over plants! Says for bloom to do 12”-18” but I didn’t wanna toast them since last light was only about 725ppfd at 15”!