Apogee SQ-645 Owner's Manual - Page 7

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Spectral Response

Cosine Response

Mean spectral response measurements of

six replicate Apogee SQ-600 series Quantum

Light Pollution Sensors. Spectral response

measurements were made at 10 nm

increments across a wavelength range of

300 to 1100 nm in a monochromator with

an attached electric light source. Measured

spectral data from each quantum light

pollution sensor were normalized by the

measured spectral response of the

monochromator/electric light combination,

which was measured with a

spectroradiometer

Directional, or cosine, response is defined as the

measurement error at a specific angle of radiation

incidence. Error for Apogee SQ-600 series Quantum Light

Pollution Sensor is approximately ± 2 % and ± 5 % at solar

zenith angles of 45° and 75°, respectively.