The beneficial health effects of the sun are well documented, and skylights allow natural light to enter dark areas of the home, offering better visibility, an inviting warmth, and more vitamin D for your health. Skylights come in three basic types, ventilating, fixed, and tubular with plastic or glass glazing, and a variety of shapes, including: flat, arched, domed, and pyramid. Skylights are installed at the same pitch as the roof. Adding skylights for additional natural light can greatly reduce the cost of electrical lighting, particularly in consistently darker areas of the home. Bathroom skylights add natural light, and if ventilating, can assist in expunging moisture and preventing mildew, rot and mold. Kitchen skylights provide additional light for visibility when cooking. Bedroom skylights provide natural light during the day time, and a beautiful view of the stars at night. Skylights in an attic provide natural light, give the illusion of extra space, can ventilate excess heat from the house, and provide an emergency escape route. Skylights let in approximately eight times as much light as windows.