Control of sunbeds is mandatory in France to ensure consumers protection against UV radiation. This control is performed by authorized body with array spectroradiometers that must be calibrated and traceable to SI. These spectroradiometers have defects (stray light) that need to be taken into account while performing the calibration. We propose a calibration method that is based on light sources which spectrum is similar to that of the light sources found in sunbeds, and by comparison to a reference spectroradiometer. This paper report on the bench and procedure developed to calibrate the array spectroradiometer as well as the calibration uncertainty.