In a German study conducted in 2014, the authors conducted a study on the effects of Red Light Therapy. A total of 136 volunteers participated in this randomised, and controlled study. Of these volunteers, 113 subjects were randomly assigned into four treatment groups were treated twice a week with either 611–650 or 570–850 nm polychromatic light and were compared with a control group (n=23). The purpose of this study was to investigate the safety and efficacy of two novel light sources for large area and full body application. The title of the paper was “A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase” and you can see the results after just 30 days in the images below.

I’ve provided a link below with the research paper in case you wish to read the full article.

Sources

A Controlled Trial to Determine the Efficacy of Red and Near-Infrared Light Treatment in Patient Satisfaction, Reduction of Fine Lines, Wrinkles, Skin Roughness, and Intradermal Collagen Density Increase - Alexander Wunsch and Karsten Matuschka Photomed Laser Surg. 2014 Feb 1; 32(2): 93–100.