Clinical studies have confirmed the positive effects of blue LED light on psoriasis plaque symptoms such as redness, scaling and thickness. Over 12 weeks of treatment the plaque symptoms improved significantly for patients in the clinical study. In some patients, a complete clearance of the plaque was observed. During the treatment free follow-up phase of one month, plaque symptoms improved slightly further, rather than worsened. 83% of patients rated the usability and comfort of the device as ideal or excellent 3.