Sunlight exposure does make some physiological sense, after all, the spectrum of light (blue light) used in phototherapy (430 to 490 - nm band) is included among the wavelengths of visible sunlight (380 - to 780 - nm). (verywellfamily.com)
Nitrogen - doped titanium dioxide absorbs visible sunlight and then releases it as electrical energy to destroy certain organic molecules bound to its surface. (pnnl.gov)
More than 80 % of the incident visible sunlight was photoelectrically converted by this composite system into electric current available for the hydrogen generation,» says Schedel - Niedrig. (sciencedaily.com)