This question is most often asked to determine whether the measurements being obtained are reliable and correct. In this case, one generally wants to know the “full-scale” response of their sensor, or what would be seen under the most ideal conditions. However, LI-COR light sensors can measure values far above the full-scale response, so the maximum value that can be obtained may not be a correct value to use when determining whether the measurements are reliable and correct.
The LI-210/R is a photometric sensor that has a linear response up to 100 klux. The full-scale value on a clear sunny day is approximately 25 klux. Direct sunlight measurements may be closer to 100 klux and cloud-edge effects can also occur in these measurements.
If you have any questions about accuracy of LI-COR light sensors, please contact us for assistance.