Tubular light guides (TLGs) represent a solution for energy efficient performance of light during a day based on the daylight transport into building interiors. While daylight from windows sufficiently illuminates rooms close to building envelopes the light guides improve visual environment and perception of architectural space in deeper parts of interiors. The main aim of this study is focussed on the evaluation of efficiency of two selected TLG systems experimentally tested in temperate climatic conditions. Firstly, daylight illuminance measurements under the light guide installations were performed for one year period with documentation of the typical daily illuminance courses. The measurement results show differences between daylight efficiency of these systems. Secondly, spectral reflectance of the light guide tubes was measured and analysed to find out material influence on light transport effectiveness. Finally, daylight simulations were carried out applying software HOLIGILM for determination of daylight illuminance under the TLG of various dimensions. The study gives general overview about potentials of daylighting applications for straight light pipe systems.

管状光导（TLG）代表了一种解决方案，该解决方案基于日光向建筑物内部的传输，从而实现了一天中的高能效照明。窗户的日光足以照亮靠近建筑围护结构的房间，而光导则改善了视觉环境，并改善了室内更深处的建筑空间。这项研究的主要目的是集中评估在温带气候条件下进行试验的两种选定的TLG系统的效率。首先，日光照度在光导装置下进行的测量为期一年，并记录了典型的每日照度课程。测量结果表明这些系统的日光效率之间存在差异。其次，对导光管的光谱反射率进行了测量和分析，以找出材料对光传输效率的影响。最后，使用HOLIGILM软件进行日光模拟，以确定各种尺寸的TLG下的日光照度。该研究概述了直管系统采光的潜力。