Since lighting accounts for 20% of global electricity consumption in buildings, daylighting system is an important solution to achieve energy savings in lighting and to reduce carbon dioxide emissions. However, most of the existing fiber-optics daylighting systems are expensive, sensitive to pointing error and complicated in optical design in which multi-stage focusing devices are needed to minimize non uniformity of focused sunlight. To overcome the aforementioned problems, we propose a novel active daylighting system using two-stage non-imaging solar concentrator (2S-NISC) inspired by our previous experience in non-imaging optics. The 2S-NISC prototype consists of 80 primary facet mirrors with a dimension of 5 cm x 5 cm each, 20 secondary facet mirrors with a dimension of 8 cm x 8 cm each, and densely packed plastic optical fibers as a daylight distribution system. Considering the input solar power of 170 W, the equivalent power conversion efficiency of 2S-NISC prototype is obtained as 22%. For economic analysis, the proposed active daylighting system using 2S-NISC with optimized collective area of 4 m(2) is estimated to cost USD 1231.20. Considering the interest rate of 4% and fuel inflation rate of 2%, the total payback period is determined as 6.1 years, which is reasonable because the active daylighting system can last for at least 15 years. (C) 2017 Elsevier Ltd. All rights reserved.