Calibrating light sensors is crucial for providing accurate and reliable measurements across various lighting conditions. When working with production line calibration for optical sensors, calibrate the sensor before moving on to system-level calibration. This initial calibration consists of fine-tuning the response of the sensor, correcting for any variations due to manufacturing tolerances. At the system level, there are several situations where the sensor reading is different from the light incident on the system and compensation is required, such as dark cover glass, cutouts in the product case, diffusers, light pipes, lenses, and more. For similar instances, the sensor must again be calibrated to meet the requirements of the system and offset any system-level differences such as the percent transmission of the dark cover glass. The LIGHTSOURCE01EVM is specifically designed to provide a uniform and stable light source for both device-level and system-level calibration.