https://www.visosystems.com/videos/
Tutorial videos and product demos are short-cuts to optimizing your light measurement system and understanding important topics as UGR and TLA
photometryvideosvisosystemslight
https://www.sigmaaldrich.com/LK/en/applications/analytical-chemistry/photometry-and-reflectometry
Photometry measures light absorption for analyte quantification, while reflectometry determines surface characteristics like color.
photometryreflectometry