Recently there was article/paper on HN about specific UV light wavelength from LED diodes that can produce very good response without daylight, creating signifi

Recently there was article/paper on HN about specific UV light wavelength from LED diodes that can produce very good response without daylight, creating significant amount of vitamin D. https://www.nature.com/articles/s41598-017-11362-2 https://www.nature.com/articles/s41598-017-11362-2 "The 293 nm LED was best suited for evaluating its effectiveness for producing vitamin D in human skin due to the shorter exposure time" I tried looking for that manufacturer/diode but it seems it is not commercially available. By now we should be able to buy a cheap lamp at any store maybe it would save some lives.