Will I need sunscreen when I’m exposed to Red Light Therapy?

No, because sunscreens protect by blocking harmful UV rays. UV rays don’t exist in Red Light Therapy. A sunscreen will not affect how much red or Near Infrared light from Red Light Therapy reaches your body tissues, unless it is a total sunscreen like zinc paste which can block lights of all wavelengths. However, zinc paste covers such a small body area that it hardly matters.