There are an increasing number of reports pointing to biological effects of exposure to different colors of light. For example, blue light has been associated with sleep and metabolic regulations10,15,48 and light therapy has been used to control depression.20,26 Exposing patients’ skin to light of 830 nanometer wavelength accelerated wound healing.52 Different wavelengths of light significantly reduced the release of pronociceptive interleukin-6 (405nm-blue) and interleukin-8 (405nm blue, 532nm green, and 650nm red) in a time-dependent manner.
from The Journal of Pain http://bit.ly/2GPZK24
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