One of the easiest and most effective solutions is a blind or net curtain that shuts out or diffuses some of the light. You can then think about adding a lamp, LED strips, or even a glare free monitor light bar to introduce lower, more controllable light when and where you want it. If blinds or curtains arent an option, and you have the space, try positioning the monitor away from the window, or ideally perpendicular to the incoming light, rather than having the light source behind you. Other...