Color Flag (image) Penn State Caption This is a rainbow pattern as seen under a long-linear, fluorescent light source common for commercial interiors (top). And, the same rainbow pattern as it appears under a non-commercial, fluorescent light source (bottom). The color differences result from the use of different phosphors in the lights glass tubing. Credit Patrick Mansell Usage Restrictions Non commercial use only Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.