The brain is an electrochemical machine that is influenced by the frequencies of everything it experiences as created by light, sound, and color. Information goes to the amygdala, which is a key area in emotion regulation, then gets processed to the emotional body (see sheath bodies) for interpretation ... then reaction. The wavelength of certain light frequency plays and important role in how we behave at a given time. The color of light influences the way the brain processes emotional stimuli. Try and experiment using ambient lights and see how your body reacts.

Emotion processing in the brain is influenced by the color of ambient light   PhysOrg - October 31, 2010
The results of their study show that the color of light influences the way the brain processes emotional stimuli.

We are all aware that a bright day may lift our mood. However the brain mechanisms involved in such effects of light are largely unknown. Researchers at the Cyclotron Research Centre (University of Liege), Geneva Center for Neuroscience and Swiss Center for Affective Sciences (University of Geneva), and Surrey Sleep Research Centre (University of Surrey) investigated the immediate effect of light, and of its color composition, on emotion brain processing using functional magnetic resonance imaging. The results of their study show that the color of light influences the way the brain processes emotional stimuli.

Brain activity of healthy volunteers was recorded while they listened to 'angry voices' and 'neutral voices' and were exposed to blue or green light. Blue light not only increased responses to emotional stimuli in the 'voice area' of the brain and in the hippocampus, which is important for memory processes, but also led to a tighter interaction between the voice area, the amygdala, which is a key area in emotion regulation, and the hypothalamus, which is essential for biological rhythms regulation by light This demonstrates that the functional organization of the brain was affected by blue light.

The acute effects of ambient light on emotional processing might differ from its longer-lasting effects on mood, but the present findings in healthy subjects have important implications for our understanding of the mechanisms by which changes in lighting environment could improves mood, not only in mood disorders using light therapy, but also in our day to day life, by paying more attention to our light environment at home and in the work place.