Check out this gorgeous french doors and picture window replacement we did for this home in Marina Del, Mar, CA! This is the ultimate way of increasing the amount of natural light you get in your home. Natural light during both the morning and evening has been shown to increase concentration and focus. Feeling foggy? Try looking out your french doors and picture window and soak up the sun for a few minutes for a boost of alertness. A naturally lit house will help you be more productive than an artificially lit home.