Light therapy not only helps with mood disorders, bright light also known to help with other mental disorders like bipolar disorder, depression. Here is a chart from psycheducation.org showing the comparison of effectiveness of light and anti-depressent. If you can get the same benefits with less or no side effects, not medicating yourself is a better approach, I think.
Blue lights are found to control emotions. To be exact it’s found that blue light taps directly into the areas that process both good and bad emotions.
Feel good on sunny days and gloomy on gray and cloudy days? Attribute it to blue sky. Feel elated to be near water especially crisp blue water in the Indian ocean? Again blue color.
Gilles Vandewalle at the University of Liège, Belgium, and colleagues wondered whether this pathway directly affects our emotional state too. To find out, they scanned the brains of volunteers exposed to green or blue light while a neutral or angry voice recited meaningless words. As expected, brain areas responsible for processing emotion responded more strongly to the angry voice, but this effect was amplified by blue light (Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.1010180107).
During functional magnetic resonance imaging, 17 healthy volunteers listened to emotional and neutral vocal stimuli while being exposed to alternating 40-s periods of blue or green ambient light. Blue (relative to green) light increased responses to emotional stimuli in the voice area of the temporal cortex and in the hippocampus. During emotional processing, the functional connectivity between the voice area, the amygdala, and the hypothalamus was selectively enhanced in the context of blue illumination, which shows that responses to emotional stimulation in the hypothalamus and amygdala are influenced by both the decoding of vocal information in the voice area and the spectral quality of ambient light. These results demonstrate the acute influence of light and its spectral quality on emotional brain processing and identify a unique network merging affective and ambient light information.