I did my first session on Thursday May 5th. and by that evening I felt an improvement in my back.. I have a serious curvature and degenerated discs and dr. said the only other option to improve my life was surgery. Then I read about the Platinumled 900. Bought it with the horizontal stand and it has literally changed my life. I have always been an active farm girl, exercise physiologist and competitive distance runner until this back issue took me down. I'm 80 yrs. old now and with this light therapy twice a day for 20 min I am back to doing all kinds of physical activities (not running anymore though) Dr. told me that if I hadn't been so active all my life I would probably be bedridden. This light therapy is as close to a miracle as I could ever ask for. Thank you Platinumled.