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Spectral errors can be approximated using wavelength dependent calculations that account for the spectral response of the quantum sensor, the spectral output of calibration light source, and the spectral output of light source being measured. The table below displays the calculated theoretical spectral errors and corresponding correction factors for many different popular lights sources. The spectral errors are calculated relative to each sensor's calibration source (the SQ-100X is calibrated to clear-sky sunlight, the SQ-500 are calibrated to 4100K cool white fluorescent T5 lamps).
To correct for spectral error multiply your measured value by the correction factor (CF) associated with your light source. For example, if you are using an SQ-500 under a Blue LED (448nm), which has a spectral error of 0.8 and a CF of 0.99, and you measured 115 µmol m-2 s-1, you would multiply your measurement of 115 µmol m-2 s-1 by the CF 0.99 to get 113.85 µmol m-2 s-1 (115 x 0.99 = 133.85).
SQ-100X correction factors apply to models SQ-100X, 202X, 204X, and 205X, 420X, 421X, 422X, and MQ-100X, 200X, and 210X.
SQ-500 correction factors apply to models SQ-500, 512, 514, 515, 520, 521, 522, and MQ-500, 501, and 510.
This information is also available as an interactive tool, which allows users to upload their own lighting spectrum.