Document Type


Publication Date

Spring 3-2005


Changing the integration time has the potential to change the accuracy of the Apogee/StellarNet spectroradiometer. All Apogee/StellarNet spectroradiometers are calibrated to an NIST traceable calibration lamp. This lamp (LI-COR Inc., model 1800-02; Lincoln, NE) has an output of 206.2 µmol m-2 s-1, which requires a relatively long integration time (about 500 ms) to obtain a full scale response. Sunlight and high-wattage electric light sources often have a much higher intensity, which require much shorter integration times (10 to100 ms) to prevent light saturation of the detectors. The accuracy might be affected differently by increasing or decreasing integration times from the initial calibration time.