This study found that blue light improved immune response with pnuemonia. I encourage you to read the short abstract in the link below.  They found that ” blue spectrum light shifts autonomic tone toward parasympathetic predominance and enhances immune competence, as characterized by accelerated pathogen clearance that is accompanied by reduced alveolar neutrophil influx, inflammation, and improved survival.”  Our predominant focus with our in-home light therapy systems is to help shift the body into the nervous system response to rest, digest and heal. Here is more evidence that this approach is powerful.