Spectral Errors for PPFD and YPFD Measurements with Apogee MQ Series Quantum Meters
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Reflected from Grass Canopy
Reflected from Deciduous Canopy
Reflected from Conifer Canopy
Transmitted below Grass Canopy
Transmitted below Deciduous Canopy
Transmitted below Conifer Canopy
Radiation Source (Error Calculated Relative to Cool White
Fluorescent, T5)
Cool White Fluorescent (T5)
Cool White Fluorescent (T8)
Cool White Fluorescent (T12)
Blue LED (448 nm peak, 20 nm full-width half-maximum)
Green LED (524 nm peak, 30 nm full-width half-maximum)
Red LED (635 nm peak, 20 nm full-width half-maximum)
Red, Blue LED Mixture (85 % Red, 15 % Blue)
Red, Green, Blue LED Mixture (72 % Red, 16 % Green, 12 % Blue)
Cool White Fluorescent LED
Neutral White Fluorescent LED
Warm White Fluorescent LED
Quantum sensors can be a very practical means of measuring PPFD and YPFD from multiple radiation sources, but
spectral errors must be considered. The spectral errors in the table above can be used as correction factors for
individual radiation sources.
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