Should I worry that I've been using this daily for a year, per my sleep doctor, for delayed sleep phase syndrome? Philips GoLITE BLU - https://www.amazon.com/P

Should I worry that I've been using this daily for a year, per my sleep doctor, for delayed sleep phase syndrome? Philips GoLITE BLU - https://www.amazon.com/Philips-GoLITE-BLU-Energy-Light/dp/B00M3SGCUE/ https://www.amazon.com/Philips-GoLITE-BLU-Energy-Light/dp/B0... 30 minutes a day at the highest setting...