Are there any scientific claims to blue light? Or real studies? I tried using flux for a month and ended up with sore eyes which I don't get when I don't use fl

Are there any scientific claims to blue light? Or real studies? I tried using flux for a month and ended up with sore eyes which I don't get when I don't use flux. So I don't know if this blue thing is a legit thing or not. My flat mate says he sleeps better. But I just get sore eyes.