Vision is a complex process in the brain, decoded by the combination of different wavelengths of light. Photoreceptors in the retina convert light into electrical impulses. The electrical nerve impulses are then transmitted to ganglion cells in the retina and subsequently to the visual cortex in the brain, which processes this neural activity into a colored image. Different wavelengths of light also influence sleep-wake rhythm, with specialized ganglion cells signaling to the internal clock on whether it is daytime or nighttime, based on light color. The latest research, however, indicates the light-sensitive ganglion cells as being the most important for the human internal clock, as the color of light appears to play a very small role, with no evidence showing variation in the color of light affects the internal clock or sleep.
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Light color is less important for the internal clock than originally thought, study finds
