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Re:UV B LEDs More Effective in Producing Vitamin D3 in Human... by ajsnigrutin on Wednesday October 28, 2020 @06:02PM (#24924619)
Meh... just use a tube, like in the old country:

https://www.nationalgeographic.com/content/dam/photography/p... (might be a bit nsfwish for some people)

Re:UV B LEDs More Effective in Producing Vitamin D3 in Human... by m0zg on Wednesday October 28, 2020 @06:30PM (#24924882)
Can confirm. This was daily routine in children's hospitals and some kindergartens. Aimed to prevent rickets. As were contrast foot baths.