"Development of daylight exploitation products has been accelerated during last decade thanks to an increasing demand for an improvement in environmental conditions for living and a need for energy saving. Among these products, the light-pipes, which bring natural light indoors where sunlight cannot reach without generating excessive heat, are gaining more and more interest.. In this paper a review of the commercially available tubular light transportation systems, for Europe and USA, has been carried out.. In addition first experimental results of a tubular system application in a low-energy house (Leaf House) under climatic conditions of North Italy have been reported..
