Apogee SQ-300 Series Owner's Manual - Page 12

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Spectral Errors for PPF and YPF Measurements with Apogee SQ Series Quantum Sensors
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Sun (Clear Sky)
Sun (Cloudy 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)
Compact Fluorescent
Metal Halide
Ceramic Metal Halide
High Pressure Sodium
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 PPF and YPF 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.
PPF Error
YPF Error
[%]
[%]
0.0
0.0
1.4
1.6
5.7
-6.3
4.9
-7.0
5.5
-6.8
6.4
-4.5
6.8
-5.4
5.3
2.6
0.0
0.0
-0.3
-1.2
-1.4
-2.0
-0.5
-5.3
-3.7
-3.7
-6.0
-6.4
0.8
-7.2
-12.7
8.0
8.0
26.2
4.8
-6.2
2.4
-4.4
3.4
0.2
-4.6
-0.6
-6.7
-5.2
-10.9
-13.0
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