Unfortunately, not at all. Vitamin D3 (aka cholecalciferol or simply Vitamin D) is synthesised after UV-B ultraviolet radiation (295-315nm) skin exposure. LED light therapy treatments do not involved any UV light emission (<400nm wavelength). Most LED treatments involve red (~625-750nm) or near infrared (~750-2500nm) light. Some LED treatments also involve blue light, which is at about 400-500nm…