1 min readControlled Lighting TestRobert E. LewisWeb Community ManagerFeb 26, 2015 Image Article A controlled lighting test at the LETF. The device in the image shows the spectrum of the background illumination. A controlled lighting test at the LETF. The device in the image shows the spectrum of the background illumination. Share Details Last Updated Aug 29, 2023 EditorRobert E. Lewis Related TermsHuman Health and Performance