Suntubes are a type of roof light which collect light from above the roof, reflect it through a tube and then let it out through the other end. The value of this really comes to fore with buildings which don’t have flat roofs or have unused attics, as it can take the sunlight from those areas and release it somewhere where it will have an impact on the people inside the building.
Suntubes are typically of a smaller size, but depending upon what the side collecting the light is designed like, it can be a very effective sunlight collector. They can be an ideal addition to a home with areas where there is little sunlight, such as upstairs corridors or even cellars.