Lights (IMAGE) Rensselaer Polytechnic Institute Caption Researchers have found that the circadian system may be able to distinguish between lights of different colors. Credit Rensselaer/Lighting Research Center Usage Restrictions None 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.