Photometric Solutions International (PSI) is a 100% Australian owned and run scientific company, specializing in the design and manufacture of products for the measurement of light and lighting systems – photometric and spectroradiometric testing and measurement equipment.We have a dedicated team of people with the experience and knowledge to provide the complete service. The company may be new but the people are not, with decades of experience in photometry, colorimetry, radiometry and integrated system design and development.