Renewable energy sources like sunlight are important for lighting up dark spaces. A tubular daylighting device (TDD) is a type of device that can capture sunlight and bring it into buildings. In this study, researchers looked at how different factors affect the performance of TDD. They used computer simulations to test a TDD with a transparent dome and mirror tube in different seasons. The results showed that TDD can provide the right amount of light for buildings, even in deep or tall structures, by capturing both direct and scattered sunlight.