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Spectral Quality Requirement

Meaning

The specific clinical demand for light of a particular wavelength or color spectrum to elicit a desired non-visual biological response from the human circadian system. This requirement recognizes that the intrinsically photosensitive Retinal Ganglion Cells (ipRGCs) are maximally sensitive to the blue-green wavelengths (approximately 460-480 nm), which are distinct from the peak sensitivity of visual photoreceptors. Understanding the Spectral Quality Requirement is paramount for designing effective light interventions, such as those used in Cognitive Alertness Induction or Melatonin Phase Shifting. Using the correct spectrum ensures the maximum therapeutic impact on the master clock.