Why can humans produce Vitamin B from sunlight but not from artificial light sources?
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We require ultraviolet radiation within the “B” range of wavelengths. Artificial lights aim to have little UV to avoid damage to materials such as cracked plastics and faded print, or damage to delicate tissue like the eyes. Simple light sources that rely on heating, just can’t achieve a high enough temperature without being destroyed to emit UV. The intensity of artificial lights is also much lower than that of the sun. Brighter lights cost more money to run, and we don’t need them for most tasks.
It is Vitamin D.
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