The article doesn't distinguish between UV, visible, and IR. Red light and infrared have known direct biological effects as well. Could the benefits of sun expo

The article doesn't distinguish between UV, visible, and IR. Red light and infrared have known direct biological effects as well. Could the benefits of sun exposure be due, in part, to red and IR? Vitamin D is UV dependent, but you can probably get some benefits of other wavelengths without UV exposure. However, it is possible that synergy exists among the various biological responses to different wavelengths.