This dome then channels the light into your living space through
highly reflective metal tubing; there is a special lens at the end of the tube to diffuse the harvested sunlight, which evenly spreads the captured light through the room These days TDDs also come with customization, such as added ventilation, daylight dimmers, even a lightbulb add - on kit to create a
multifunctional system — but all this adds to cost and complexity of the
product.