Window Tinting
Basic light control is critical.
First, keeping glare down is necessary when someone is sleeping in the daytime or when watching TV or working at a desk near a bright window.
Second, UV rays from bright sunlight will adversly affect fabrics, furnishings, and artwork in your home. Full sun can quickly fade expensive upholstery and rugs, eventually causing some fibers to break down and rot.
In areas of very strong sunlight, look into window tinting options where a film is attached directly to the glass. This will reduce UV rays and is available in several levels of tint.