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In a hypothetical scenario, where a large, permanently manned craft is in a continual orbit, and natural sunlight cannot be used as the craft may keep moving and turning, artificial sunlight is used in the form of LED panels.

My question is this: Will the LEDs have any adverse effect on the human body? The LEDs are of the SoLED variety which have very low IR levels and almost nil UV light levels, have any adverse effects on the body? I suppose the lack of UV may cause some disturbance in Vitamin D and melanin levels. Is this valid? Would there be any other problems?

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    $\begingroup$ You could easily supplement Vitamin D. $\endgroup$ – Chris Jan 30 '16 at 20:02
  • $\begingroup$ But will that be the only issue? $\endgroup$ – Malhar Khushu Jan 31 '16 at 11:34
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Yes. Natural sunlight doesn't have a good substituent.

Melatonin levels and circardian rhythms are directly affected by natural sunlight.

As far as LEDs goes, a french study concluded that blue light may have photochemical risks and affect our retina.

Source

http://www.ledinside.com/knowledge/2014/4/effect_of_artificual_and_natural_light_on_the_human_body

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