Circadian rhythm/SAD—As discussed previously, red/NIR lights are not optimal for use as SAD lights for treating/preventing seasonal affective disorder or for optimizing circadian rhythm with bright light in the mornings. However, the bright light devices used for circadian rhythm optimization/SAD prevention typically have a huge amount of blue light and little to no red/near-infrared light. Blue in isolation can be harmful to both the eyes and skin, so I always advise using the red/NIR light alongside the bright white/blue light to counteract the blue and give some healing to your cells at the
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