A number of factors affect the measurements by charge coupled (CCD) array spectroradiometers, including stray light, dynamic response and ambient temperature. The departure from linearity was assessed for four CCD array spectroradiometers and linearity correction calculated with standard uncertainties error estimates. A fixed irradiance source supplemented with neutral density filters was used to allow tests to cover a full range of operational conditions. The dependence of the dynamic response on well depth and integration time was investigated. One spectroradiometer exhibited an accumulated departure from linearity of ∼20 % near the top of the well; for others the departure from linearity was less pronounced.