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 License Licensed content 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.