ABSTRACT
<b>Objective</b>: To assess the effectiveness of preferred colored light on psychosomatic state.<br> <b>Methods</b>: Preferred color light and other colored light were projected on a screen and shown to experimental and control subjects. To determine the effect of such light, mood adjective scores as determined by the Multiple Mood Scale (MMS) were measured as an emotional parameter, and levels of salivary chromogranin A (CgA) and salivary immune globulin A were measured as biochemical parameters. This study was performed in a randomized, crossover design. These data were analyzed statistically and a<i> p </i>value less than 0.05 was considered significant.<br> <b>Results</b>: After being exposed to preferred colored lights, mean MMS scores indicating positive moods, such as well-being increased significantly (p = 0.025), and scores indicating negative moods, such as depression and boredom decreased significantly (p = 0.005, p = 0.041). Mean value of salivary CgA also decreased and was significantly different between experimental and control group (p < 0.001).<br> <b>Conclusion</b>: Preferred colored light may be effective in promoting a calm positive state.<br>