You wrote that you don’t take the pills. And I was a manager of a UVB clinic 20 years and have many patents on lamps and phototherapy. Anyway, goodby, try not to offend.
Nope, I think you misunderstood my post. 
I have said repeatedly that I DO take the pills. 
(I changed one of my posts above to make that more clear.)
Good day to you, too. 
I think it’s best if we quit this discussion before it becomes an argument. 
Hi All, I am interested in either building or buying (cost-effective) a sub 300nm (293nm minimum) LED or fluorescent UVB device (portable?). Ultraviolet B Light Emitting Diodes (LEDs) Are More Efficient and Effective in Producing Vitamin D3 in Human Skin Compared to Natural Sunlight | Scientific Reports It seems that if you can dial in the specific nm frequency (293-298nm), you don’t need much artificial light source time exposure to get significant Vit D skin production response - as compared to sunlight exposure (depends on your latitude, Sun zenith angle and weather/cloud conditions). So anyone have some straight forward options? You may not need so many watts - due to the specific nm Vit D production frequency efficiency. PS Any light detector device out there to also actually access the real nm number radiating from the light source?
Other than the smd packages that were linked earlier in the thread the closest uvb range I could find so far was through digikey in the 295nm range. DigiKey]https://www.digikey.com/en/products/detail/marktech-optoelectronics/MTSM295UV2-F1120S/15816636?s=N4IgjCBcoCwAxVAYygMwIYBsDOBTANCAPZQDa4AbAOxhwDMIAuoQA4AuUIAymwE4CWAOwDmIAL6EwATgAcUxCBSQMOAsTIgEjMRJAAmDQFcAbgAJMuACZMxQA